Complete and Total Terrain Overhaul (CATTO)

Mod that overhauls overworld terrain generation giving it a much larger scale and adding new biomes

Features

Realistic looking erosion

Giant mountains and oceans

Increased terrain height and depth: -320 to 2032

More stone layers

New biomes including:

• Marshes
• Grasslands
• Kelp Forests
• Brine Pools

Required Mods

While not completely needed C2ME OpenCl Acceleration will make the terrain generate much faster - requires you to start minecraft with java 25

Recommended Mods

• Blooming Biosphere - It's cliff changes make the steep terrain look so much better
• Voxy or Distant Horizons - Makes the terrain visible without melting your computer

Compatibility

This mod includes patches for:

• C2ME OpenCl Acceleration
• Blooming Biosphere - Make sure to load the built in compatibility patch after the datapack
• Create Cosmonautics and Deep Seas

Incompatible with other terrain mods

Report any issues with other mods that the world height causes on github

Erosion

The erosion in this mod is made using Runevision's erosion filter you can find the original here: https://www.shadertoy.com/view/sf23W1 \ Also check out Runevision's youtube channel: https://www.youtube.com/@runevision and blog post about this technique: https://blog.runevision.com/2026/03/fast-and-gorgeous-erosion-filter.html