Flat Dimensions

Flat Dimensions changes the terrain of the three vanilla dimensions through a datapack, setting a flat sea level for each. Players add it from the datapack screen while creating a world, and the flat layout then applies to the whole world rather than a single preset. Because the terrain is capped, the usual caves and ravines do not generate in these worlds.

Creators who want a superflat world beyond the built-in preset can use the mod as a base. The author notes that datapacks allow custom superflat presets, but a preset can only use a single biome, and changes to structures or feature generation must be made globally, so the mod covers the dimensions instead. Nether fossils are placed below lava in the Nether, a case the author says could not be solved with a datapack alone until a later change.

The mod is open source under the MIT License and is published for Fabric, Forge, NeoForge and Quilt. Its files target 1.20 – 1.21.10, with 1.0.1 as the latest build, first released on 2025-08-03 and last updated on 2025-10-17. The server needs it, while clients may leave it out. It is also available as a data pack for server platforms.