diff --git a/src/main/java/com/sk89q/worldedit/EditSession.java b/src/main/java/com/sk89q/worldedit/EditSession.java
index c0bcba033..040be35a0 100644
--- a/src/main/java/com/sk89q/worldedit/EditSession.java
+++ b/src/main/java/com/sk89q/worldedit/EditSession.java
@@ -168,7 +168,7 @@ public class EditSession {
     public boolean rawSetBlock(Vector pt, BaseBlock block) {
         final int y = pt.getBlockY();
         final int type = block.getType();
-        if (y < 0 || y > 127) {
+        if (y < 0 || y > world.getMaxY()) {
             return false;
         }
 
@@ -1046,7 +1046,7 @@ public class EditSession {
      */
     public int removeAbove(Vector pos, int size, int height)
             throws MaxChangedBlocksException {
-        int maxY = Math.min(127, pos.getBlockY() + height - 1);
+        int maxY = Math.min(world.getMaxY(), pos.getBlockY() + height - 1);
         --size;
         int affected = 0;
 
@@ -1122,7 +1122,7 @@ public class EditSession {
         int minX = pos.getBlockX() - size;
         int maxX = pos.getBlockX() + size;
         int minY = Math.max(0, pos.getBlockY() - size);
-        int maxY = Math.min(127, pos.getBlockY() + size);
+        int maxY = Math.min(world.getMaxY(), pos.getBlockY() + size);
         int minZ = pos.getBlockZ() - size;
         int maxZ = pos.getBlockZ() + size;
 
@@ -1584,7 +1584,7 @@ public class EditSession {
         Vector min = region.getMinimumPoint();
         Vector max = region.getMaximumPoint();
 
-        int upperY = Math.min(127, max.getBlockY() + 1);
+        int upperY = Math.min(world.getMaxY(), max.getBlockY() + 1);
         int lowerY = Math.max(0, min.getBlockY() - 1);
 
         int affected = 0;
@@ -1599,7 +1599,7 @@ public class EditSession {
                 for (int y = upperY; y >= lowerY; --y) {
                     Vector above = new Vector(x, y + 1, z);
 
-                    if (y + 1 <= 127 && !getBlock(new Vector(x, y, z)).isAir()
+                    if (y + 1 <= world.getMaxY() && !getBlock(new Vector(x, y, z)).isAir()
                             && getBlock(above).isAir()) {
                         if (setBlock(above, block)) {
                             ++affected;
@@ -1626,7 +1626,7 @@ public class EditSession {
         Vector min = region.getMinimumPoint();
         Vector max = region.getMaximumPoint();
 
-        int upperY = Math.min(127, max.getBlockY() + 1);
+        int upperY = Math.min(world.getMaxY(), max.getBlockY() + 1);
         int lowerY = Math.max(0, min.getBlockY() - 1);
 
         int affected = 0;
@@ -1641,7 +1641,7 @@ public class EditSession {
                 for (int y = upperY; y >= lowerY; --y) {
                     Vector above = new Vector(x, y + 1, z);
 
-                    if (y + 1 <= 127 && !getBlock(new Vector(x, y, z)).isAir()
+                    if (y + 1 <= world.getMaxY() && !getBlock(new Vector(x, y, z)).isAir()
                             && getBlock(above).isAir()) {
                         if (setBlock(above, pattern.next(above))) {
                             ++affected;
@@ -1668,7 +1668,7 @@ public class EditSession {
         Vector min = region.getMinimumPoint();
         Vector max = region.getMaximumPoint();
 
-        int upperY = Math.min(127, max.getBlockY() + 1);
+        int upperY = Math.min(world.getMaxY(), max.getBlockY() + 1);
         int lowerY = Math.max(0, min.getBlockY() - 1);
 
         int affected = 0;
@@ -2020,8 +2020,8 @@ public class EditSession {
 
         if (pos.getBlockY() - height - 1 < 0) {
             height = pos.getBlockY() + 1;
-        } else if (pos.getBlockY() + height - 1 > 127) {
-            height = 127 - pos.getBlockY() + 1;
+        } else if (pos.getBlockY() + height - 1 > world.getMaxY()) {
+            height = world.getMaxY() - pos.getBlockY() + 1;
         }
 
         final double invRadiusX = 1 / radiusX;
@@ -2253,7 +2253,7 @@ public class EditSession {
                     continue;
                 }
 
-                for (int y = 127; y >= 1; --y) {
+                for (int y = world.getMaxY(); y >= 1; --y) {
                     Vector pt = new Vector(x, y, z);
                     int id = getBlockType(pt);
 
@@ -2312,7 +2312,7 @@ public class EditSession {
                     continue;
                 }
 
-                for (int y = 127; y >= 1; --y) {
+                for (int y = world.getMaxY(); y >= 1; --y) {
                     Vector pt = new Vector(x, y, z);
                     int id = getBlockType(pt);
 
@@ -2334,7 +2334,7 @@ public class EditSession {
                     }
 
                     // Too high?
-                    if (y == 127) {
+                    if (y == world.getMaxY()) {
                         break;
                     }
 
@@ -2376,7 +2376,7 @@ public class EditSession {
                     continue;
                 }
 
-                loop: for (int y = 127; y >= 1; --y) {
+                loop: for (int y = world.getMaxY(); y >= 1; --y) {
                     final Vector pt = new Vector(x, y, z);
                     final int id = getBlockType(pt);
 
diff --git a/src/main/java/com/sk89q/worldedit/LocalPlayer.java b/src/main/java/com/sk89q/worldedit/LocalPlayer.java
index 9f3989224..983343161 100644
--- a/src/main/java/com/sk89q/worldedit/LocalPlayer.java
+++ b/src/main/java/com/sk89q/worldedit/LocalPlayer.java
@@ -230,7 +230,7 @@ public abstract class LocalPlayer extends LocalCommandSender {
             return false;
         }
 
-        while (y <= 127) {
+        while (y <= world.getMaxY()) {
             // Found a ceiling!
             if (!BlockType.canPassThrough(world.getBlockType(new Vector(x, y, z)))) {
                 int platformY = Math.max(initialY, y - 3 - clearance);
@@ -257,7 +257,7 @@ public abstract class LocalPlayer extends LocalCommandSender {
         int initialY = Math.max(0, pos.getBlockY());
         int y = Math.max(0, pos.getBlockY() + 1);
         int z = pos.getBlockZ();
-        int maxY = Math.min(128, initialY + distance);
+        int maxY = Math.min(getWorld().getMaxY() + 1, initialY + distance);
         LocalWorld world = getPosition().getWorld();
 
         while (y <= 129) {
diff --git a/src/main/java/com/sk89q/worldedit/LocalSession.java b/src/main/java/com/sk89q/worldedit/LocalSession.java
index cf563c984..733f88f0b 100644
--- a/src/main/java/com/sk89q/worldedit/LocalSession.java
+++ b/src/main/java/com/sk89q/worldedit/LocalSession.java
@@ -56,7 +56,6 @@ public class LocalSession {
     private LocalConfiguration config;
 
     private long expirationTime = 0;
-    private LocalWorld selectionWorld;
     private RegionSelector selector = new CuboidRegionSelector();
     private boolean placeAtPos1 = false;
     private LinkedList<EditSession> history = new LinkedList<EditSession>();
@@ -183,10 +182,10 @@ public class LocalSession {
      * @return position
      */
     public RegionSelector getRegionSelector(LocalWorld world) {
-        if (selectionWorld == null) {
-            selectionWorld = world;
-        } else if (!selectionWorld.equals(world)) {
-            selectionWorld = world;
+        if (selector.getIncompleteRegion().getWorld() == null) {
+            selector = new CuboidRegionSelector(world);
+        } else if (!selector.getIncompleteRegion().getWorld().equals(world)) {
+            selector.getIncompleteRegion().setWorld(world);
             selector.clear();
         }
         return selector;
@@ -198,6 +197,7 @@ public class LocalSession {
      *
      * @return position
      */
+    @Deprecated
     public RegionSelector getRegionSelector() {
         return selector;
     }
@@ -209,7 +209,7 @@ public class LocalSession {
      * @param selector
      */
     public void setRegionSelector(LocalWorld world, RegionSelector selector) {
-        selectionWorld = world;
+        selector.getIncompleteRegion().setWorld(world);
         this.selector = selector;
     }
 
@@ -230,7 +230,7 @@ public class LocalSession {
      * @return
      */
     public boolean isSelectionDefined(LocalWorld world) {
-        if (selectionWorld == null || !selectionWorld.equals(world)) {
+        if (selector.getIncompleteRegion().getWorld() == null || !selector.getIncompleteRegion().getWorld().equals(world)) {
             return false;
         }
         return selector.isDefined();
@@ -258,7 +258,7 @@ public class LocalSession {
      * @throws IncompleteRegionException
      */
     public Region getSelection(LocalWorld world) throws IncompleteRegionException {
-        if (selectionWorld == null || !selectionWorld.equals(world)) {
+        if (selector.getIncompleteRegion().getWorld() == null || !selector.getIncompleteRegion().getWorld().equals(world)) {
             throw new IncompleteRegionException();
         }
         return selector.getRegion();
@@ -270,7 +270,7 @@ public class LocalSession {
      * @return
      */
     public LocalWorld getSelectionWorld() {
-        return selectionWorld;
+        return selector.getIncompleteRegion().getWorld();
     }
 
     /**
diff --git a/src/main/java/com/sk89q/worldedit/LocalWorld.java b/src/main/java/com/sk89q/worldedit/LocalWorld.java
index 9912976c5..f63d980ad 100644
--- a/src/main/java/com/sk89q/worldedit/LocalWorld.java
+++ b/src/main/java/com/sk89q/worldedit/LocalWorld.java
@@ -357,7 +357,7 @@ public abstract class LocalWorld {
      * 
      * @return
      */
-    public int getHeight() {
+    public int getMaxY() {
         return 127;
     }
 
diff --git a/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java b/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java
index 59bac1fe1..450e95e0c 100644
--- a/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java
+++ b/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java
@@ -226,14 +226,14 @@ public class BukkitWorld extends LocalWorld {
      */
     @Override
     public boolean regenerate(Region region, EditSession editSession) {
-        BaseBlock[] history = new BaseBlock[16 * 16 * 128];
+        BaseBlock[] history = new BaseBlock[16 * 16 * (getMaxY() + 1)];
 
         for (Vector2D chunk : region.getChunks()) {
             Vector min = new Vector(chunk.getBlockX() * 16, 0, chunk.getBlockZ() * 16);
 
             // First save all the blocks inside
             for (int x = 0; x < 16; ++x) {
-                for (int y = 0; y < 128; ++y) {
+                for (int y = 0; y < (getMaxY() + 1); ++y) {
                     for (int z = 0; z < 16; ++z) {
                         Vector pt = min.add(x, y, z);
                         int index = y * 16 * 16 + z * 16 + x;
@@ -250,7 +250,7 @@ public class BukkitWorld extends LocalWorld {
 
             // Then restore 
             for (int x = 0; x < 16; ++x) {
-                for (int y = 0; y < 128; ++y) {
+                for (int y = 0; y < (getMaxY() + 1); ++y) {
                     for (int z = 0; z < 16; ++z) {
                         Vector pt = min.add(x, y, z);
                         int index = y * 16 * 16 + z * 16 + x;
@@ -761,7 +761,7 @@ public class BukkitWorld extends LocalWorld {
     }
 
     @Override
-    public int getHeight() {
+    public int getMaxY() {
         return world.getMaxHeight() - 1;
     }
 
@@ -775,7 +775,6 @@ public class BukkitWorld extends LocalWorld {
     }
 
     private static final int chunkSizeX = 16;
-    private static final int chunkSizeY = 128;
     private static final int chunkSizeZ = 16;
 
     @Override
@@ -810,8 +809,8 @@ public class BukkitWorld extends LocalWorld {
                     boolean xBorder = x == 0 || x == chunkSizeX - 1;
                     for (int z = 0; z < chunkSizeZ; ++z) {
                         boolean zBorder = z == 0 || z == chunkSizeZ - 1;
-                        for (int y = 0; y < chunkSizeY; ++y) {
-                            final int index = y + z * chunkSizeY + x * chunkSizeY * chunkSizeZ;
+                        for (int y = 0; y < world.getMaxHeight(); ++y) {
+                            final int index = y + z * world.getMaxHeight() + x * world.getMaxHeight() * chunkSizeZ;
                             byte blockID = blocks[index];
                             if (!BlockType.emitsLight(blockID)) {
                                 if (xBorder || zBorder && BlockType.isTranslucent(blockID)) {
diff --git a/src/main/java/com/sk89q/worldedit/bukkit/EditSessionBlockChangeDelegate.java b/src/main/java/com/sk89q/worldedit/bukkit/EditSessionBlockChangeDelegate.java
index a7a813d55..df61cdcf7 100644
--- a/src/main/java/com/sk89q/worldedit/bukkit/EditSessionBlockChangeDelegate.java
+++ b/src/main/java/com/sk89q/worldedit/bukkit/EditSessionBlockChangeDelegate.java
@@ -58,6 +58,6 @@ public class EditSessionBlockChangeDelegate implements BlockChangeDelegate {
     }
 
     public int getHeight() {
-        return editSession.getWorld().getHeight();
+        return editSession.getWorld().getMaxY();
     }
 }
diff --git a/src/main/java/com/sk89q/worldedit/bukkit/WorldEditPlugin.java b/src/main/java/com/sk89q/worldedit/bukkit/WorldEditPlugin.java
index adbc00a98..b6dc0142e 100644
--- a/src/main/java/com/sk89q/worldedit/bukkit/WorldEditPlugin.java
+++ b/src/main/java/com/sk89q/worldedit/bukkit/WorldEditPlugin.java
@@ -378,7 +378,7 @@ public class WorldEditPlugin extends JavaPlugin {
         }
 
         LocalSession session = controller.getSession(wrapPlayer(player));
-        RegionSelector selector = session.getRegionSelector();
+        RegionSelector selector = session.getRegionSelector(BukkitUtil.getLocalWorld(player.getWorld()));
 
         try {
             Region region = selector.getRegion();
diff --git a/src/main/java/com/sk89q/worldedit/bukkit/selections/CuboidSelection.java b/src/main/java/com/sk89q/worldedit/bukkit/selections/CuboidSelection.java
index f40ab3567..24ab3ab2c 100644
--- a/src/main/java/com/sk89q/worldedit/bukkit/selections/CuboidSelection.java
+++ b/src/main/java/com/sk89q/worldedit/bukkit/selections/CuboidSelection.java
@@ -44,8 +44,8 @@ public class CuboidSelection extends RegionSelection {
         if (pt2 == null) {
             throw new IllegalArgumentException("Null point 2 not permitted");
         }
-
-        CuboidRegionSelector sel = new CuboidRegionSelector();
+        
+        CuboidRegionSelector sel = new CuboidRegionSelector(BukkitUtil.getLocalWorld(world));
         sel.selectPrimary(pt1);
         sel.selectSecondary(pt2);
 
diff --git a/src/main/java/com/sk89q/worldedit/bukkit/selections/Polygonal2DSelection.java b/src/main/java/com/sk89q/worldedit/bukkit/selections/Polygonal2DSelection.java
index fb5f77ef9..0a892479a 100644
--- a/src/main/java/com/sk89q/worldedit/bukkit/selections/Polygonal2DSelection.java
+++ b/src/main/java/com/sk89q/worldedit/bukkit/selections/Polygonal2DSelection.java
@@ -21,8 +21,11 @@ package com.sk89q.worldedit.bukkit.selections;
 
 import java.util.Collections;
 import java.util.List;
+
+import com.sk89q.worldedit.LocalWorld;
 import org.bukkit.World;
 import com.sk89q.worldedit.BlockVector2D;
+import com.sk89q.worldedit.bukkit.BukkitUtil;
 import com.sk89q.worldedit.regions.*;
 
 public class Polygonal2DSelection extends RegionSelection {
@@ -36,13 +39,13 @@ public class Polygonal2DSelection extends RegionSelection {
 
     public Polygonal2DSelection(World world, List<BlockVector2D> points, int minY, int maxY) {
         super(world);
+        LocalWorld lWorld = BukkitUtil.getLocalWorld(world);
 
-        minY = Math.min(Math.max(0, minY), 127);
-        maxY = Math.min(Math.max(0, maxY), 127);
-
-        Polygonal2DRegionSelector sel = new Polygonal2DRegionSelector();
-        poly2d = new Polygonal2DRegion(points, minY, maxY);
+        minY = Math.min(Math.max(0, minY), world.getMaxHeight());
+        maxY = Math.min(Math.max(0, maxY), world.getMaxHeight());
 
+        Polygonal2DRegionSelector sel = new Polygonal2DRegionSelector(BukkitUtil.getLocalWorld(world));
+        poly2d = new Polygonal2DRegion(lWorld, points, minY, maxY);
         sel.learnChanges();
 
         setRegionSelector(sel);
diff --git a/src/main/java/com/sk89q/worldedit/commands/RegionCommands.java b/src/main/java/com/sk89q/worldedit/commands/RegionCommands.java
index de230baa1..f139aa86b 100644
--- a/src/main/java/com/sk89q/worldedit/commands/RegionCommands.java
+++ b/src/main/java/com/sk89q/worldedit/commands/RegionCommands.java
@@ -264,8 +264,8 @@ public class RegionCommands {
                 region.expand(dir.multiply(count));
                 region.contract(dir.multiply(count));
 
-                session.getRegionSelector().learnChanges();
-                session.getRegionSelector().explainRegionAdjust(player, session);
+                session.getRegionSelector(player.getWorld()).learnChanges();
+                session.getRegionSelector(player.getWorld()).explainRegionAdjust(player, session);
             } catch (RegionOperationException e) {
                 player.printError(e.getMessage());
             }
@@ -309,8 +309,8 @@ public class RegionCommands {
                 region.expand(shiftVector);
                 region.contract(shiftVector);
 
-                session.getRegionSelector().learnChanges();
-                session.getRegionSelector().explainRegionAdjust(player, session);
+                session.getRegionSelector(player.getWorld()).learnChanges();
+                session.getRegionSelector(player.getWorld()).explainRegionAdjust(player, session);
             } catch (RegionOperationException e) {
                 player.printError(e.getMessage());
             }
diff --git a/src/main/java/com/sk89q/worldedit/commands/SelectionCommands.java b/src/main/java/com/sk89q/worldedit/commands/SelectionCommands.java
index caaa328c5..1f3461a6b 100644
--- a/src/main/java/com/sk89q/worldedit/commands/SelectionCommands.java
+++ b/src/main/java/com/sk89q/worldedit/commands/SelectionCommands.java
@@ -194,7 +194,7 @@ public class SelectionCommands {
             final Vector2D max2D = ChunkStore.toChunk(region.getMaximumPoint());
 
             min = new Vector(min2D.getBlockX() * 16, 0, min2D.getBlockZ() * 16);
-            max = new Vector(max2D.getBlockX() * 16 + 15, 127, max2D.getBlockZ() * 16 + 15);
+            max = new Vector(max2D.getBlockX() * 16 + 15, player.getWorld().getMaxY(), max2D.getBlockZ() * 16 + 15);
 
             player.print("Chunks selected: ("
                     + min2D.getBlockX() + ", " + min2D.getBlockZ() + ") - ("
@@ -203,13 +203,13 @@ public class SelectionCommands {
             final Vector2D min2D = ChunkStore.toChunk(player.getBlockIn());
 
             min = new Vector(min2D.getBlockX() * 16, 0, min2D.getBlockZ() * 16);
-            max = min.add(15, 127, 15);
+            max = min.add(15, player.getWorld().getMaxY(), 15);
 
             player.print("Chunk selected: "
                     + min2D.getBlockX() + ", " + min2D.getBlockZ());
         }
 
-        CuboidRegionSelector selector = new CuboidRegionSelector();
+        CuboidRegionSelector selector = new CuboidRegionSelector(player.getWorld());
         selector.selectPrimary(min);
         selector.selectSecondary(max);
         session.setRegionSelector(player.getWorld(), selector);
@@ -276,11 +276,11 @@ public class SelectionCommands {
             Region region = session.getSelection(player.getWorld());
             try {
                 int oldSize = region.getArea();
-                region.expand(new Vector(0, 128, 0));
-                region.expand(new Vector(0, -128, 0));
-                session.getRegionSelector().learnChanges();
+                region.expand(new Vector(0, (player.getWorld().getMaxY() + 1), 0));
+                region.expand(new Vector(0, -(player.getWorld().getMaxY() + 1), 0));
+                session.getRegionSelector(player.getWorld()).learnChanges();
                 int newSize = region.getArea();
-                session.getRegionSelector().explainRegionAdjust(player, session);
+                session.getRegionSelector(player.getWorld()).explainRegionAdjust(player, session);
                 player.print("Region expanded " + (newSize - oldSize)
                         + " blocks [top-to-bottom].");
             } catch (RegionOperationException e) {
@@ -323,10 +323,10 @@ public class SelectionCommands {
             region.expand(dir.multiply(reverseChange));
         }
 
-        session.getRegionSelector().learnChanges();
+        session.getRegionSelector(player.getWorld()).learnChanges();
         int newSize = region.getArea();
-
-        session.getRegionSelector().explainRegionAdjust(player, session);
+        
+        session.getRegionSelector(player.getWorld()).explainRegionAdjust(player, session);
 
         player.print("Region expanded " + (newSize - oldSize) + " blocks.");
     }
@@ -374,10 +374,11 @@ public class SelectionCommands {
             if (reverseChange != 0) {
                 region.contract(dir.multiply(reverseChange));
             }
-            session.getRegionSelector().learnChanges();
+            session.getRegionSelector(player.getWorld()).learnChanges();
             int newSize = region.getArea();
+            
+            session.getRegionSelector(player.getWorld()).explainRegionAdjust(player, session);
 
-            session.getRegionSelector().explainRegionAdjust(player, session);
 
             player.print("Region contracted " + (oldSize - newSize) + " blocks.");
         } catch (RegionOperationException e) {
@@ -409,9 +410,9 @@ public class SelectionCommands {
             Region region = session.getSelection(player.getWorld());
             region.expand(dir.multiply(change));
             region.contract(dir.multiply(change));
-            session.getRegionSelector().learnChanges();
-
-            session.getRegionSelector().explainRegionAdjust(player, session);
+            session.getRegionSelector(player.getWorld()).learnChanges();
+            
+            session.getRegionSelector(player.getWorld()).explainRegionAdjust(player, session);
 
             player.print("Region shifted.");
         } catch (RegionOperationException e) {
@@ -453,9 +454,9 @@ public class SelectionCommands {
                 region.expand((new Vector(0, 0, -1)).multiply(change));
             }
 
-            session.getRegionSelector().learnChanges();
-
-            session.getRegionSelector().explainRegionAdjust(player, session);
+            session.getRegionSelector(player.getWorld()).learnChanges();
+            
+            session.getRegionSelector(player.getWorld()).explainRegionAdjust(player, session);
 
             player.print("Region outset.");
         } catch (RegionOperationException e) {
@@ -496,9 +497,9 @@ public class SelectionCommands {
             region.contract((new Vector(0, 0, -1)).multiply(change));
         }
 
-        session.getRegionSelector().learnChanges();
-
-        session.getRegionSelector().explainRegionAdjust(player, session);
+        session.getRegionSelector(player.getWorld()).learnChanges();
+        
+        session.getRegionSelector(player.getWorld()).explainRegionAdjust(player, session);
 
         player.print("Region inset.");
     }
@@ -520,9 +521,9 @@ public class SelectionCommands {
                 .subtract(region.getMinimumPoint())
                 .add(1, 1, 1);
 
-        player.print("Type: " + session.getRegionSelector().getTypeName());
-
-        for (String line : session.getRegionSelector().getInformationLines()) {
+        player.print("Type: " + session.getRegionSelector(player.getWorld()).getTypeName());
+        
+        for (String line : session.getRegionSelector(player.getWorld()).getInformationLines()) {
             player.print(line);
         }
 
@@ -625,7 +626,7 @@ public class SelectionCommands {
             selector = new ExtendingCuboidRegionSelector(oldSelector);
             player.print("Cuboid: left click for a starting point, right click to extend");
         } else if (typeName.equalsIgnoreCase("poly")) {
-            selector = new Polygonal2DRegionSelector();
+            selector = new Polygonal2DRegionSelector(world);
             player.print("2D polygon selector: Left/right click to add a point.");
         } else {
             player.printError("Only 'cuboid', 'extend' and 'poly' are accepted.");
diff --git a/src/main/java/com/sk89q/worldedit/commands/UtilityCommands.java b/src/main/java/com/sk89q/worldedit/commands/UtilityCommands.java
index 08e871217..0343944fd 100644
--- a/src/main/java/com/sk89q/worldedit/commands/UtilityCommands.java
+++ b/src/main/java/com/sk89q/worldedit/commands/UtilityCommands.java
@@ -173,7 +173,8 @@ public class UtilityCommands {
         
         int size = args.argsLength() > 0 ? Math.max(1, args.getInteger(0)) : 1;
         we.checkMaxRadius(size);
-        int height = args.argsLength() > 1 ? Math.min(128, args.getInteger(1) + 2) : 128;
+        LocalWorld world = player.getWorld();
+        int height = args.argsLength() > 1 ? Math.min((world.getMaxY() + 1), args.getInteger(1) + 2) : (world.getMaxY() + 1);
 
         int affected = editSession.removeAbove(
                 session.getPlacementPosition(player), size, height);
@@ -195,7 +196,8 @@ public class UtilityCommands {
 
         int size = args.argsLength() > 0 ? Math.max(1, args.getInteger(0)) : 1;
         we.checkMaxRadius(size);
-        int height = args.argsLength() > 1 ? Math.min(128, args.getInteger(1) + 2) : 128;
+        LocalWorld world = player.getWorld();
+        int height = args.argsLength() > 1 ? Math.min((world.getMaxY() + 1), args.getInteger(1) + 2) : (world.getMaxY() + 1);
 
         int affected = editSession.removeBelow(session.getPlacementPosition(player), size, height);
         player.print(affected + " block(s) have been removed.");
@@ -251,7 +253,7 @@ public class UtilityCommands {
         Vector base = session.getPlacementPosition(player);
         Vector min = base.subtract(size, size, size);
         Vector max = base.add(size, size, size);
-        Region region = new CuboidRegion(min, max);
+        Region region = new CuboidRegion(player.getWorld(), min, max);
 
         if (to instanceof SingleBlockPattern) {
             affected = editSession.replaceBlocks(region, from, ((SingleBlockPattern) to).getBlock());
diff --git a/src/main/java/com/sk89q/worldedit/data/Chunk.java b/src/main/java/com/sk89q/worldedit/data/Chunk.java
index 37629de1a..493d468b6 100644
--- a/src/main/java/com/sk89q/worldedit/data/Chunk.java
+++ b/src/main/java/com/sk89q/worldedit/data/Chunk.java
@@ -37,7 +37,9 @@ public class Chunk {
     private byte[] data;
     private int rootX;
     private int rootZ;
-    private Map<BlockVector, Map<String, Tag>> tileEntities;
+
+    private Map<BlockVector, Map<String,Tag>> tileEntities;
+    private LocalWorld world;
 
     /**
      * Construct the chunk with a compound tag.
@@ -45,8 +47,9 @@ public class Chunk {
      * @param tag
      * @throws DataException
      */
-    public Chunk(CompoundTag tag) throws DataException {
+    public Chunk(LocalWorld world, CompoundTag tag) throws DataException {
         rootTag = tag;
+        this.world = world;
 
         blocks = getChildTag(
                 rootTag.getValue(), "Blocks", ByteArrayTag.class).getValue();
@@ -57,14 +60,14 @@ public class Chunk {
         rootZ = getChildTag(
                 rootTag.getValue(), "zPos", IntTag.class).getValue();
 
-        if (blocks.length != 32768) {
+        if (blocks.length != 16*16*(world.getMaxY() + 1)) {
             throw new InvalidFormatException("Chunk blocks byte array expected "
-                    + "to be 32,768 bytes; found " + blocks.length);
+                    + "to be " + 16*16*(world.getMaxY() + 1) + " bytes; found " + blocks.length);
         }
 
-        if (data.length != 16384) {
+        if (data.length != 16*16*((world.getMaxY() + 1)/2)) {
             throw new InvalidFormatException("Chunk block data byte array "
-                    + "expected to be 16,384 bytes; found " + data.length);
+                    + "expected to be " + 16*16*((world.getMaxY() + 1)/2) + " bytes; found " + data.length);
         }
     }
 
@@ -79,7 +82,7 @@ public class Chunk {
         int x = pos.getBlockX() - rootX * 16;
         int y = pos.getBlockY();
         int z = pos.getBlockZ() - rootZ * 16;
-        int index = y + (z * 128 + (x * 128 * 16));
+        int index = y + (z * (world.getMaxY() + 1) + (x * (world.getMaxY() + 1) * 16));
 
         try {
             return blocks[index];
@@ -99,7 +102,7 @@ public class Chunk {
         int x = pos.getBlockX() - rootX * 16;
         int y = pos.getBlockY();
         int z = pos.getBlockZ() - rootZ * 16;
-        int index = y + (z * 128 + (x * 128 * 16));
+        int index = y + (z * (world.getMaxY() + 1) + (x * (world.getMaxY() + 1) * 16));
         boolean shift = index % 2 == 0;
         index /= 2;
 
diff --git a/src/main/java/com/sk89q/worldedit/data/ChunkStore.java b/src/main/java/com/sk89q/worldedit/data/ChunkStore.java
index 4c5574b27..c2745245a 100644
--- a/src/main/java/com/sk89q/worldedit/data/ChunkStore.java
+++ b/src/main/java/com/sk89q/worldedit/data/ChunkStore.java
@@ -50,7 +50,7 @@ public abstract class ChunkStore {
      * @throws DataException
      * @throws IOException
      */
-    public abstract CompoundTag getChunkTag(Vector2D pos, String world)
+    public abstract CompoundTag getChunkTag(Vector2D pos, LocalWorld world)
             throws DataException, IOException;
 
     /**
@@ -62,9 +62,9 @@ public abstract class ChunkStore {
      * @throws IOException
      * @throws DataException
      */
-    public Chunk getChunk(Vector2D pos, String world)
+    public Chunk getChunk(Vector2D pos, LocalWorld world)
             throws DataException, IOException {
-        return new Chunk(getChunkTag(pos, world));
+        return new Chunk(world, getChunkTag(pos, world));
     }
 
     /**
diff --git a/src/main/java/com/sk89q/worldedit/data/LegacyChunkStore.java b/src/main/java/com/sk89q/worldedit/data/LegacyChunkStore.java
index c10f20b53..61efc35a3 100644
--- a/src/main/java/com/sk89q/worldedit/data/LegacyChunkStore.java
+++ b/src/main/java/com/sk89q/worldedit/data/LegacyChunkStore.java
@@ -74,7 +74,7 @@ public abstract class LegacyChunkStore extends ChunkStore {
      * @throws IOException
      */
     @Override
-    public CompoundTag getChunkTag(Vector2D pos, String world)
+    public CompoundTag getChunkTag(Vector2D pos, LocalWorld world)
             throws DataException, IOException {
         int x = pos.getBlockX();
         int z = pos.getBlockZ();
diff --git a/src/main/java/com/sk89q/worldedit/data/McRegionChunkStore.java b/src/main/java/com/sk89q/worldedit/data/McRegionChunkStore.java
index f6106cf1e..58ad4c799 100644
--- a/src/main/java/com/sk89q/worldedit/data/McRegionChunkStore.java
+++ b/src/main/java/com/sk89q/worldedit/data/McRegionChunkStore.java
@@ -25,6 +25,7 @@ import java.util.Map;
 import com.sk89q.jnbt.CompoundTag;
 import com.sk89q.jnbt.NBTInputStream;
 import com.sk89q.jnbt.Tag;
+import com.sk89q.worldedit.LocalWorld;
 import com.sk89q.worldedit.Vector2D;
 
 public abstract class McRegionChunkStore extends ChunkStore {
@@ -65,10 +66,11 @@ public abstract class McRegionChunkStore extends ChunkStore {
     }
 
     @Override
-    public CompoundTag getChunkTag(Vector2D pos, String worldname) throws DataException,
+    public CompoundTag getChunkTag(Vector2D pos, LocalWorld world) throws DataException,
             IOException {
+        
+        McRegionReader reader = getReader(pos, world.getName());
 
-        McRegionReader reader = getReader(pos, worldname);
         InputStream stream = reader.getChunkInputStream(pos);
         NBTInputStream nbt = new NBTInputStream(stream);
         Tag tag;
diff --git a/src/main/java/com/sk89q/worldedit/regions/CuboidRegion.java b/src/main/java/com/sk89q/worldedit/regions/CuboidRegion.java
index 9f706c27e..fcdd2a080 100644
--- a/src/main/java/com/sk89q/worldedit/regions/CuboidRegion.java
+++ b/src/main/java/com/sk89q/worldedit/regions/CuboidRegion.java
@@ -20,6 +20,7 @@
 package com.sk89q.worldedit.regions;
 
 import com.sk89q.worldedit.BlockVector;
+import com.sk89q.worldedit.LocalWorld;
 import com.sk89q.worldedit.Vector;
 import com.sk89q.worldedit.Vector2D;
 import com.sk89q.worldedit.data.ChunkStore;
@@ -40,6 +41,10 @@ public class CuboidRegion implements Region {
      * Store the second point.
      */
     private Vector pos2;
+    /**
+     * Stores the world.
+     */
+    private LocalWorld world;
 
     /**
      * Construct a new instance of this cuboid region.
@@ -48,7 +53,19 @@ public class CuboidRegion implements Region {
      * @param pos2
      */
     public CuboidRegion(Vector pos1, Vector pos2) {
+        this(null, pos1, pos2);
+    }
+    
+    /**
+     * Construct a new instance of this cuboid region.
+     * 
+     * @param world
+     * @param pos1
+     * @param pos2
+     */
+    public CuboidRegion(LocalWorld world, Vector pos1, Vector pos2) {
         this.pos1 = pos1;
+        this.world = world;
         this.pos2 = pos2;
     }
 
@@ -172,8 +189,8 @@ public class CuboidRegion implements Region {
             }
         }
 
-        pos1 = pos1.clampY(0, 127);
-        pos2 = pos2.clampY(0, 127);
+        pos1 = pos1.clampY(0, world.getMaxY());
+        pos2 = pos2.clampY(0, world.getMaxY());
     }
 
     /**
@@ -224,8 +241,8 @@ public class CuboidRegion implements Region {
             }
         }
 
-        pos1 = pos1.clampY(0, 127);
-        pos2 = pos2.clampY(0, 127);
+        pos1 = pos1.clampY(0, world == null ? 127 : world.getMaxY());
+        pos2 = pos2.clampY(0, world == null ? 127 : world.getMaxY());
     }
 
     /**
@@ -353,4 +370,12 @@ public class CuboidRegion implements Region {
     public String toString() {
         return getMinimumPoint() + " - " + getMaximumPoint();
     }
+
+    public LocalWorld getWorld() {
+        return world;
+    }
+
+    public void setWorld(LocalWorld world) {
+        this.world = world;
+    }
 }
diff --git a/src/main/java/com/sk89q/worldedit/regions/CuboidRegionSelector.java b/src/main/java/com/sk89q/worldedit/regions/CuboidRegionSelector.java
index 4cfdb487c..4ef908bb3 100644
--- a/src/main/java/com/sk89q/worldedit/regions/CuboidRegionSelector.java
+++ b/src/main/java/com/sk89q/worldedit/regions/CuboidRegionSelector.java
@@ -25,6 +25,7 @@ import com.sk89q.worldedit.BlockVector;
 import com.sk89q.worldedit.IncompleteRegionException;
 import com.sk89q.worldedit.LocalPlayer;
 import com.sk89q.worldedit.LocalSession;
+import com.sk89q.worldedit.LocalWorld;
 import com.sk89q.worldedit.Vector;
 import com.sk89q.worldedit.cui.CUIPointBasedRegion;
 import com.sk89q.worldedit.cui.SelectionPointEvent;
@@ -37,12 +38,18 @@ import com.sk89q.worldedit.cui.SelectionPointEvent;
 public class CuboidRegionSelector implements RegionSelector, CUIPointBasedRegion {
     protected BlockVector pos1;
     protected BlockVector pos2;
-    protected CuboidRegion region = new CuboidRegion(new Vector(), new Vector());
+    protected CuboidRegion region;
+    
+    public CuboidRegionSelector(LocalWorld world) {
+       region = new CuboidRegion(world, new Vector(), new Vector());
+    }
 
     public CuboidRegionSelector() {
+        this((LocalWorld)null);
     }
 
     public CuboidRegionSelector(RegionSelector oldSelector) {
+        region = new CuboidRegion(oldSelector.getIncompleteRegion().getWorld(), new Vector(), new Vector());
         if (oldSelector instanceof CuboidRegionSelector) {
             final CuboidRegionSelector cuboidRegionSelector = (CuboidRegionSelector) oldSelector;
 
diff --git a/src/main/java/com/sk89q/worldedit/regions/Polygonal2DRegion.java b/src/main/java/com/sk89q/worldedit/regions/Polygonal2DRegion.java
index 0d8bd30c7..ca69cecce 100644
--- a/src/main/java/com/sk89q/worldedit/regions/Polygonal2DRegion.java
+++ b/src/main/java/com/sk89q/worldedit/regions/Polygonal2DRegion.java
@@ -27,6 +27,7 @@ import java.util.List;
 import java.util.Set;
 import com.sk89q.worldedit.BlockVector;
 import com.sk89q.worldedit.BlockVector2D;
+import com.sk89q.worldedit.LocalWorld;
 import com.sk89q.worldedit.Vector;
 import com.sk89q.worldedit.Vector2D;
 import com.sk89q.worldedit.data.ChunkStore;
@@ -43,30 +44,43 @@ public class Polygonal2DRegion implements Region {
     protected int minY;
     protected int maxY;
     protected boolean hasY = false;
+    protected LocalWorld world;
 
     /**
-     * Construct the region.
+     * Construct the region
      */
     public Polygonal2DRegion() {
+        this(null);
+    }
+    
+    /**
+     * Construct the region.
+     * 
+     * @param world
+     */
+    public Polygonal2DRegion(LocalWorld world) {
         points = new ArrayList<BlockVector2D>();
         minY = 0;
         maxY = 0;
         hasY = false;
+        this.world = world;
         recalculate();
     }
 
     /**
      * Construct the region.
      * 
+     * @param world
      * @param points
      * @param minY
      * @param maxY
      */
-    public Polygonal2DRegion(List<BlockVector2D> points, int minY, int maxY) {
+    public Polygonal2DRegion(LocalWorld world, List<BlockVector2D> points, int minY, int maxY) {
         this.points = points;
         this.minY = minY;
         this.maxY = maxY;
         hasY = true;
+        this.world = world;
         recalculate();
     }
 
@@ -109,6 +123,9 @@ public class Polygonal2DRegion implements Region {
         minY = Math.min(oldMinY, oldMaxY);
         maxY = Math.max(oldMinY, oldMaxY);
 
+        minY = Math.min(Math.max(0, minY), world == null ? 127 : world.getMaxY());
+        maxY = Math.min(Math.max(0, maxY), world == null ? 127 : world.getMaxY());
+
         min = new BlockVector(minX, minY, minZ);
         max = new BlockVector(maxX, maxY, maxZ);
     }
@@ -567,4 +584,12 @@ public class Polygonal2DRegion implements Region {
             throw new UnsupportedOperationException("Not supported");
         }
     }
+
+    public LocalWorld getWorld() {
+        return world;
+    }
+
+    public void setWorld(LocalWorld world) {
+        this.world = world;
+    }
 }
diff --git a/src/main/java/com/sk89q/worldedit/regions/Polygonal2DRegionSelector.java b/src/main/java/com/sk89q/worldedit/regions/Polygonal2DRegionSelector.java
index 452ae42be..3597eb498 100644
--- a/src/main/java/com/sk89q/worldedit/regions/Polygonal2DRegionSelector.java
+++ b/src/main/java/com/sk89q/worldedit/regions/Polygonal2DRegionSelector.java
@@ -26,6 +26,7 @@ import com.sk89q.worldedit.BlockVector2D;
 import com.sk89q.worldedit.IncompleteRegionException;
 import com.sk89q.worldedit.LocalPlayer;
 import com.sk89q.worldedit.LocalSession;
+import com.sk89q.worldedit.LocalWorld;
 import com.sk89q.worldedit.Vector;
 import com.sk89q.worldedit.cui.CUIPointBasedRegion;
 import com.sk89q.worldedit.cui.SelectionMinMaxEvent;
@@ -39,7 +40,11 @@ import com.sk89q.worldedit.cui.SelectionShapeEvent;
  */
 public class Polygonal2DRegionSelector implements RegionSelector, CUIPointBasedRegion {
     protected BlockVector pos1;
-    protected Polygonal2DRegion region = new Polygonal2DRegion();
+    protected Polygonal2DRegion region;
+    
+    public Polygonal2DRegionSelector(LocalWorld world) {
+        region = new Polygonal2DRegion(world);
+    }
 
     public boolean selectPrimary(Vector pos) {
         if (pos.equals(pos1)) {
@@ -47,7 +52,7 @@ public class Polygonal2DRegionSelector implements RegionSelector, CUIPointBasedR
         }
 
         pos1 = pos.toBlockVector();
-        region = new Polygonal2DRegion();
+        region = new Polygonal2DRegion(region.getWorld());
         region.addPoint(pos);
         region.expandY(pos.getBlockY());
 
@@ -124,7 +129,7 @@ public class Polygonal2DRegionSelector implements RegionSelector, CUIPointBasedR
 
     public void clear() {
         pos1 = null;
-        region = new Polygonal2DRegion();
+        region = new Polygonal2DRegion(region.getWorld());
     }
 
     public String getTypeName() {
diff --git a/src/main/java/com/sk89q/worldedit/regions/Region.java b/src/main/java/com/sk89q/worldedit/regions/Region.java
index 1f4c0d3bf..d75becee4 100644
--- a/src/main/java/com/sk89q/worldedit/regions/Region.java
+++ b/src/main/java/com/sk89q/worldedit/regions/Region.java
@@ -20,6 +20,7 @@
 package com.sk89q.worldedit.regions;
 
 import com.sk89q.worldedit.BlockVector;
+import com.sk89q.worldedit.LocalWorld;
 import com.sk89q.worldedit.Vector;
 import com.sk89q.worldedit.Vector2D;
 import java.util.Set;
@@ -101,4 +102,18 @@ public interface Region extends Iterable<BlockVector> {
      * @return
      */
     public Set<Vector2D> getChunks();
+    
+    /**
+     * Get the world the selection is in
+     * 
+     * @return
+     */
+    public LocalWorld getWorld();
+    
+    /**
+     * Sets the world the selection is in
+     * 
+     * @return
+     */
+    public void setWorld(LocalWorld world);
 }
diff --git a/src/main/java/com/sk89q/worldedit/snapshots/SnapshotRestore.java b/src/main/java/com/sk89q/worldedit/snapshots/SnapshotRestore.java
index 19fa972d2..5f28ac404 100644
--- a/src/main/java/com/sk89q/worldedit/snapshots/SnapshotRestore.java
+++ b/src/main/java/com/sk89q/worldedit/snapshots/SnapshotRestore.java
@@ -147,7 +147,7 @@ public class SnapshotRestore {
             Chunk chunk;
 
             try {
-                chunk = chunkStore.getChunk(chunkPos, editSession.getWorld().getName());
+                chunk = chunkStore.getChunk(chunkPos, editSession.getWorld());
                 // Good, the chunk could be at least loaded
 
                 // Now just copy blocks!
diff --git a/src/main/java/com/sk89q/worldedit/tools/brushes/SmoothBrush.java b/src/main/java/com/sk89q/worldedit/tools/brushes/SmoothBrush.java
index 74dbcea0d..c7ec35847 100644
--- a/src/main/java/com/sk89q/worldedit/tools/brushes/SmoothBrush.java
+++ b/src/main/java/com/sk89q/worldedit/tools/brushes/SmoothBrush.java
@@ -23,6 +23,7 @@ import com.sk89q.worldedit.EditSession;
 import com.sk89q.worldedit.HeightMap;
 import com.sk89q.worldedit.MaxChangedBlocksException;
 import com.sk89q.worldedit.Vector;
+import com.sk89q.worldedit.WorldVector;
 import com.sk89q.worldedit.filtering.GaussianKernel;
 import com.sk89q.worldedit.filtering.HeightMapFilter;
 import com.sk89q.worldedit.patterns.Pattern;
@@ -45,9 +46,9 @@ public class SmoothBrush implements Brush {
     public void build(EditSession editSession, Vector pos, Pattern mat, double size)
             throws MaxChangedBlocksException {
         double rad = size;
-        Vector min = pos.subtract(rad, rad, rad);
+        WorldVector min = new WorldVector(editSession.getWorld(), pos.subtract(rad, rad, rad));
         Vector max = pos.add(rad, rad + 10, rad);
-        Region region = new CuboidRegion(min, max);
+        Region region = new CuboidRegion(editSession.getWorld(), min, max);
         HeightMap heightMap = new HeightMap(editSession, region, naturalOnly);
         HeightMapFilter filter = new HeightMapFilter(new GaussianKernel(5, 1.0));
         heightMap.applyFilter(filter, iterations);
diff --git a/src/main/java/com/sk89q/worldedit/util/TargetBlock.java b/src/main/java/com/sk89q/worldedit/util/TargetBlock.java
index 3fc09ba34..568afacae 100644
--- a/src/main/java/com/sk89q/worldedit/util/TargetBlock.java
+++ b/src/main/java/com/sk89q/worldedit/util/TargetBlock.java
@@ -115,7 +115,7 @@ public class TargetBlock {
             if (world.getBlockType(getCurrentBlock()) == BlockID.AIR) {
                 if (searchForLastBlock) {
                     lastBlock = getCurrentBlock();
-                    if (lastBlock.getBlockY() <= 0 || lastBlock.getBlockY() >= 127) {
+                    if (lastBlock.getBlockY() <= 0 || lastBlock.getBlockY() >= world.getMaxY()) {
                         searchForLastBlock = false;
                     }
                 }