diff --git a/src/main.lua b/src/main.lua
index d6b7d64..e3bebff 100644
--- a/src/main.lua
+++ b/src/main.lua
@@ -5,46 +5,67 @@ local lume = require "lib.lume"
 local map = {}
 
 local biomes = {
-  [1] = {
-    name = "water",
-    altitude = {min = 0, max = 0.9},
-    temperature = {min = 0.1, max = 0.9},
-    humidity = {min = 0.8, max = 1},
-    color = {0, 0, 1, 1},
-  },
-  [2] = {
-    name = "sand",
-    altitude = {min = 0.2, max = 0.9},
-    temperature = {min = 0.2, max = 1},
-    humidity = {min = 0, max = 0.2},
-    color = {1, 1, 0, 1},
-  },
-  [3] = {
-    name = "grass",
-    altitude = {min = 0.3, max = 0.9},
-    temperature = {min = 0.2, max = 0.8},
-    humidity = {min = 0.3, max = 0.6},
-    color = {0, 1, 0, 1},
-  },
-  [4] = {
-    name = "trees",
-    altitude = {min = 0.4, max = 0.7},
-    temperature = {min = 0, max = 0.7},
-    humidity = {min = 0.1, max = 1},
-    color = {0, 0.67, 0, 1},
+  [5] = {
+    name = "ocean",
+    altitude = {min = 0, max = 0.2}, -- bottom of world is the only part that matters
+    temperature = {min = 0, max = 1},
+    humidity = {min = 0, max = 1},
+    color = {0, 0, 0.67, 1},
   },
   [6] = {
+    name = "beach",
+    altitude = {min = 0.2, max = 0.205}, -- just above ocean
+    temperature = {min = 0, max = 1},
+    humidity = {min = 0, max = 0.8}, -- excluding upper humidity for swamp
+    color = {1, 1, 0.33, 1}, -- brighter yellow to distinguish from sand
+  },
+  [8] = {
+    name = "swamp", -- fun idea, but generates between ocean and water too often?
+    altitude = {min = 0, max = 1},
+    temperature = {min = 0.5, max = 1},
+    humidity = {min = 0.95, max = 1},
+    color = {0, 0.5, 0.33, 1},
+  },
+  [10] = {
+    name = "water",
+    altitude = {min = 0, max = 0.9}, -- top excluded because it should've gone downhill
+    temperature = {min = 0.1, max = 0.9}, -- bottom should be ice, top should evaporate
+    humidity = {min = 0.8, max = 1}, -- only the wettest places
+    color = {0, 0, 1, 1},
+  },
+  [20] = {
+    name = "sand",
+    altitude = {min = 0.2, max = 0.9}, -- top falls down, bottom is underwater
+    temperature = {min = 0, max = 1},
+    humidity = {min = 0, max = 0.2}, -- only where dry makes more sense for a desert
+    color = {1, 1, 0, 1},
+  },
+  [30] = {
+    name = "grass",
+    altitude = {min = 0.3, max = 0.9}, -- top of the world not enough air, bottom too wet / leaving space for others
+    temperature = {min = 0.2, max = 0.8}, -- not very sensitive to temperature
+    humidity = {min = 0.2, max = 0.6}, -- not very sensitive to humidity; but excluded from the worst
+    color = {0, 1, 0, 1},
+  },
+  [40] = {
+    name = "trees",
+    altitude = {min = 0.4, max = 0.7}, -- more sensitive than grass
+    temperature = {min = 0, max = 0.7},
+    humidity = {min = 0.3, max = 0.8}, -- these are not desert trees, they need more water
+    color = {0, 0.67, 0, 1},
+  },
+  [60] = {
     name = "stone",
     altitude = {min = 0, max = 1},
     temperature = {min = 0, max = 1},
     humidity = {min = 0, max = 1},
     color = {0.67, 0.67, 0.67, 1},
   },
-  [5] = {
+  [50] = {
     name = "ice",
     altitude = {min = 0, max = 1},
-    temperature = {min = 0, max = 0.1},
-    humidity = {min = 0.1, max = 1},
+    temperature = {min = 0, max = 0.01},
+    humidity = {min = 0.2, max = 1},
     color = {1, 1, 1, 1},
   },
 }
@@ -87,13 +108,21 @@ love.load = function()
   end
 
   -- planetizer!
+  local biome_order = {}
+  for order in pairs(biomes) do
+    biome_order[#biome_order + 1] = order
+  end
+  table.sort(biome_order)
+
   map.terrain = {w = map.size, h = map.size}
   local radius = (map.size / 2)^2
   for x = 0, map.size do
     map.terrain[x] = {}
     for y = 0, map.size do
       if lume.distance(x, y, map.size / 2, map.size / 2, true) < radius then
-        for _, biome in ipairs(biomes) do
+        -- for _, biome in ipairs(biomes) do
+        for _, order in ipairs(biome_order) do
+          local biome = biomes[order]
           local altitude = map.altitude[x][y]
           if altitude >= biome.altitude.min and altitude <= biome.altitude.max then
             local temperature = map.temperature[x][y]