diff --git a/lua/engine.lua b/lua/engine.lua
index 5d6f655..d307c15 100644
--- a/lua/engine.lua
+++ b/lua/engine.lua
@@ -2,11 +2,14 @@
 -- Constants and magic numbers
 local mapgen_buffer = 16
 
+-- Cave biome range
+local biome_spread_range = 50
+
 -- Noise params for heat_point
 local heat_noise_params =
     { offset = 50
     , scale = 50
-    , spread = { x = 200, y = 200, z = 200 }
+    , spread = { x = biome_spread_range, y = biome_spread_range, z = biome_spread_range }
     , seed = 320523
     , octaves = 2
     , persistence = 0.1
@@ -18,7 +21,7 @@ local heat_noise_params =
 local humidity_noise_params =
     { offset = 50
     , scale = 50
-    , spread = { x = 200, y = 200, z = 200 }
+    , spread = { x = biome_spread_range, y = biome_spread_range, z = biome_spread_range }
     , seed = 9923473
     , octaves = 2
     , persistence = 0.1