diff --git a/overviewer_core/tileset.py b/overviewer_core/tileset.py
index cfdf8dea..25d332e6 100644
--- a/overviewer_core/tileset.py
+++ b/overviewer_core/tileset.py
@@ -671,11 +671,11 @@ def _set_map_size(self):
             # Y has 4 times as many chunks as tiles, then halved since this is
             # a radius
             yradius = 2 * 2**p
-            # The +32 on the y bounds is because chunks are very tall, and in
+            # The +64 on the y bounds is because chunks are very tall, and in
             # rare cases when the bottom of the map is close to a border, it
             # could get cut off
             if xradius >= bounds.maxcol and -xradius <= bounds.mincol and \
-                    yradius >= bounds.maxrow + 32 and -yradius <= bounds.minrow:
+                    yradius >= bounds.maxrow + 64 and -yradius <= bounds.minrow:
                 break
         self.treedepth = p
         self.xradius = xradius
diff --git a/overviewer_core/world.py b/overviewer_core/world.py
index 1df921b6..a71ceb6b 100644
--- a/overviewer_core/world.py
+++ b/overviewer_core/world.py
@@ -1307,7 +1307,7 @@ def __init__(self, regiondir, rel):
             'minecraft:chiseled_tuff_bricks': (12670, 0),
             'minecraft:tuff_brick_stairs': (12671, 0),
             'minecraft:tuff_brick_slab': (12672, 0),
-            
+
             'minecraft:conduit': (1255, 0),
             'minecraft:sniffer_egg': (1256, 0),
             'minecraft:turtle_egg': (1257, 0),
@@ -1362,9 +1362,9 @@ def __init__(self, regiondir, rel):
             'minecraft:light': (99999, 1),
             'minecraft:moving_piston': (99999, 2),
             'minecraft:structure_void': (99999, 4),
-            
+
         }
-        
+
 
         colors = [   'white', 'orange', 'magenta', 'light_blue',
                     'yellow',   'lime',    'pink',       'gray',
@@ -1500,7 +1500,7 @@ def _get_block(self, palette_entry):
 
         colors = ['white', 'orange', 'magenta', 'light_blue', 'yellow', 'lime', 'pink', 'gray', 'light_gray', 'cyan',
                   'purple', 'blue', 'brown', 'green', 'red', 'black']
-        
+
         coral_list = [ 'tube', 'brain', 'bubble', 'fire', 'horn']
 
         key = palette_entry['Name']
@@ -2656,15 +2656,12 @@ def iterate_newer_chunks(self, filemtime):
             yield x,z,mtime
 
 class CroppedRegionSet(RegionSetWrapper):
-
-    MARGIN = 5
-
     def __init__(self, rsetobj, xmin, zmin, xmax, zmax):
         super(CroppedRegionSet, self).__init__(rsetobj)
-        self.xmin = (xmin // 16) + self.MARGIN
-        self.xmax = (xmax // 16) - self.MARGIN
-        self.zmin = (zmin // 16) + self.MARGIN
-        self.zmax = (zmax // 16) - self.MARGIN
+        self.xmin = xmin//16
+        self.xmax = xmax//16
+        self.zmin = zmin//16
+        self.zmax = zmax//16
 
     def __repr__(self):
         return "<CroppedRegionSet regiondir=%r>" % self.regiondir