The biomemap overrides the vanilla biome generation entirely, and instead allows you to specify exactly what the shapes and locations of all biomes are. It uses a set of specific colors to represent the biomes, listed below.

Biomemap File


The full path to a biomemap file to use.


See Image Requirements for the size and format requirements. The file size (in bytes) is not important for the biomemap as the BetterContinents settings store the calculated biomes, not the raw source image (like the heightmap does).

Biomemap Creation Hints

  • Setup the biome colors as swatches, or a stored palette, for easy access.
  • Place your heightmap on a background layer, then set your biome layers to 50% transparent.
  • Use a separate layer for each biome, then you can reorder the layers if needed, and even apply layer edge effects.
  • For each biome layer, fill it with the biome color entirely, then add a layer mask and paint into that, NOT the color part. This allows direct use of threshold onto the layer mask without having to convert it back and forth between color and black/white.
  • Generate masks for the biomes based on height by using “Threshold”. You can create a general land mask, and a mountains mask quite easily using this method. It can work for a basic Swamps mask as well.
  • Improve the look of your Swamp mask by applying the water mask to it to exclude all water areas from the biome. This looks cleaner on the map and should reduce the number of enemy spawning in the water.
  • If you have created a biome mask and want to grow or shrink its edges you can bake it into black and white, blur it, and then use Threshold again.
  • Improve the look of the biome edges by using the smudge tool to roughen them up. After this you can reapply threshold to make the edges crisp again.
Biomemap Colors
Color Value Biome
#0000FF Ocean
#00FF00 Meadows
#007F00 Black Forest
#7F7F00 Swamp
#FFFFFF Mountains
#FFFF00 Plains
#7F7F7F Mistlands
#00FFFF Deep North
#FF0000 Ash Lands


Command: bc param b fn