Link

Lava map

The lava map is an alternative way for defining where lava can appear. The other way is using alpha channel in the paint map.

The lava map only affects the Ashlands biome. This means you don’t need to worry about affecting other biomes.

Lava appears when the greyness is above 60% of the maximum value (99 of FF).

Lava file

Setting

Path to the lavamap.png file (16 bit greyscale).