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Biome Documentation - minecraft:overworld_generation_rules

Controls how this biome is instantiated (and then potentially modified) during world generation of the overworld.

Minecraft Overworld Generation Rules Biome Properties

Name Default Value Type Description Example Values
generate_for_climates not set Array of objects Can be just the name of a biome, or an array of any size. If an array, each entry can be a biome name string, or an array of size 2, where the first entry is a biome name and the second entry is a positive integer representing how that biome is weighted against other entries. If no weight is provided, a weight of 1 is used.
hills_transformation not set Array of strings An array of any size containing arrays of exactly two elements. For each contained array, the first element is a climate category string ('medium', 'warm', 'lukewarm', 'cold', or 'frozen'). The second element is a positive integer for how much that entry is weighted relative to other entries.
hills_transformation (Alternate 1) not set Object
mutate_transformation not set Array of strings What biome to switch to when converting to a mutated biome
mutate_transformation (Alternate 1) not set Object
river_transformation not set Array of strings What biome to switch to when converting to a river biome (if not the Vanilla 'river' biome)
river_transformation (Alternate 1) not set Object
shore_transformation not set Array of strings What biome to switch to when adjacent to an ocean biome
shore_transformation (Alternate 1) not set Object