diff --git a/src/map_generator.lua b/src/map_generator.lua
index 8df32b6..3bf3813 100644
--- a/src/map_generator.lua
+++ b/src/map_generator.lua
@@ -67,7 +67,7 @@ local biomes = {
   -- },
   [900] = {
     name = "deep ocean",
-    altitude = {min = -math.huge, max = -400},
+    altitude = {min = -math.huge, max = -5000},
     temperature = {min = -math.huge, max = math.huge},
     humidity = {min = -math.huge, max = math.huge},
     color = {0, 0, 0.25, 1},
@@ -114,19 +114,26 @@ local function generate()
 
   map.size = 500
   map.tile_size = 1
-  map.altitude = heightmap.create(map.size, map.size, -440, 8849) -- meters
+  map.altitude = heightmap.create(map.size, map.size, 0, 1) -- meters
   map.temperature = heightmap.create(map.size, map.size, -89.2, 56.7) -- celsius
   map.humidity = heightmap.create(map.size, map.size, 18, 3240) -- millimeters rainfall
 
-  local function altitude_ocean_bias(altitude)
-    local bias = 3.5 -- higher -> more ocean
-    local normalized_altitude = (altitude - -400) / (8849 - -440)
-    return -440 + normalized_altitude^bias * (8849 - -440)
+  -- local function earthlike_altitude_adjustment(altitude)
+  --   -- max too low, min too high, too much ocean
+  --   return 6099 - 114909 * altitude + 830891 * altitude^2 - 2.72e6 * altitude^3 + 4.19e6 * altitude^4 - 3.02e6 * altitude^5 + 815866 * altitude^6
+  -- end
+  local function earthlike_altitude_adjustment(altitude)
+    -- good oceans, too much high altitude
+    return -10948 + 101018 * altitude - 643382 * altitude^2 + 2.17e6 * altitude^3 - 3.62e6 * altitude^4 + 2.87e6 * altitude^5 -852042 * altitude^6
   end
+  -- local function earthlike_altitude_adjustment(altitude)
+  --   -- only creates ocean (wtf)
+  --   return -10851 + 151279 * altitude - 1.14e6 * altitude^2 +3.84e6 * altitude^3 -6.11e6 * altitude^4 +4.48e6 * altitude^5 - 1.21e6 * altitude^6
+  -- end
   local min, max = math.huge, -math.huge
   for x = 0, map.size do
     for y = 0, map.size do
-      local value = altitude_ocean_bias(map.altitude[x][y])
+      local value = earthlike_altitude_adjustment(map.altitude[x][y])
       if value > max then max = value end
       if value < min then min = value end
       map.altitude[x][y] = value