Square Biomes

square-biomes is a Fabric mod for Minecraft 1.21.11 that replaces natural biome borders with a strict square grid.

Each biome is resolved per square cell, producing a clean tiled overworld instead of vanilla’s curved climate-driven layout. The mod also supports strong randomization, so overworld biome distribution can be much less dependent on vanilla climate rules.

Features

• Square biome borders
• Configurable biome square size
• Configurable cell jitter
• Configurable random biome chance
• Random biome mode applies only to the overworld
• Nether and End are excluded from random biome selection
• Uniform random selection across unique overworld biomes

Default config

• gridSizeBlocks: 128
• cellJitter: 0.85
• randomBiomeChance: 0.8

Requirements

• Minecraft 1.21.11
• Fabric Loader
• Fabric API
• Java 21

Important

• New worlds are recommended
• Existing worlds can show visible borders where new chunks generate