Superflat Biome Extension

Selecting the Superflat Biome Extension world type during world creation produces a flat world with a regular biome distribution. The mod adds a surface fluid layer that generates on the surface like oceans, rivers, lava lakes and nether seas. Several customization options are available, and feature categories such as trees, grass, vines and sculk can be disabled individually.

The mod places features across the world, including icebergs, ice spikes and basalt pillars, ores such as iron, coal, diamond, diorite, andesite, gravel and nether quartz, and structures like amethyst geodes, desert wells and fossils. Feature categories are customized through tags in the mod's JSON files, and the project's examples show how. The mod is open source under the MIT License and runs on the client and server, so both sides need it. Files exist for Fabric only, across 1.21.6, 1.21.7, 1.21.8, 26.2 and 26.3, with the 0.3-beta build for 26.3 as the latest file.