Mountain World
by KURONAMI
Mountain World reshapes the overworld into all-mountain terrain, with peaks above Y 280 and valleys cut down to Y 80 across the whole world.
What it does
The overworld is rebuilt as endless mountains, with snow-capped peaks, deep valleys, cliff faces and waterfalls everywhere instead of gentle plains. Altitude decides where structures appear: lowland villages settle the valleys between Y 80 and Y 140, snowy villages perch on high slopes between Y 200 and Y 280, and strongholds stay deep underground.
Vanilla ores, structures, biomes and mobs are kept and remapped onto the mountain terrain. Ocean monuments, shipwrecks and ruins are excluded from the ocean cleanup, so the peaks stay clean. The mod is server-side only, so players join without installing anything, and it requires Isekai API, a worldgen framework it is built on. Files are published for NeoForge 1.21.1, and the code is not public for reuse.
Key features
Mountain overworld
Towering peaks, plunging chasms and cliff-face waterfalls cover the whole overworld in place of flat terrain.
Altitude-aware structures
Villages and strongholds are placed by height, so lowland, high-slope and underground structures each have their own band.
Vanilla content kept
Ores, structures, biomes and mobs carry over and are remapped to the new mountain volume.
Ocean cleanup
Ocean monuments, shipwrecks and ruins are excluded from the ocean changes, so the peaks stay clean.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Vertical survival worlds
Worlds built for climbing and high-altitude travel, where the terrain itself sets the route.
Sister world pairing
The mod is one of several sister worlds by the same author, including Sky World, Tropical World and Tundra World.
Who it’s for: Server owners who want a world with rugged, high-relief terrain across the whole overworld, and players who already run Isekai API.
How it compares
Valley is a Fabric, Forge and NeoForge option for 1.21.5 – 1.21.10, server required with an optional client, and it is not open source. Ocean World Dimension is open source under the MIT License, runs on Forge and NeoForge for 1.18.2 – 1.21.1, and is needed on both client and server. Mountain World is NeoForge only, for 1.21.1 alone, server-side only, and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Mountain World | NeoForge | 1.21.1 | Server-side only | 2026-05-29 |
| Valley | Fabric, Forge and NeoForge | 1.21.5 – 1.21.10 | Server required, client optional | 2025-11-12 |
| Ocean World Dimension | Forge and NeoForge | 1.18.2 – 1.21.1 | Client and server | 2025-11-28 |
Questions
Does Mountain World need Isekai API?
Does a player need the mod installed to join a server?
Which game versions are supported?
In the catalog
Mountain World is one of 8,515 World generation mods on ModsFinder, and one of 4,175 World generation mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from KURONAMI
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What the author says
The overworld, reforged as endless mountains. Towering snow-capped peaks, plunging chasm valleys, cliff-face waterfalls — the whole world becomes dramatic high-relief terrain instead of gentle plains. Built on Isekai API. Mountain World turns the overworld into all-mountain terrain — peaks reaching Y 280+, valleys…
Official listing
- Modrinth page
- modrinth.com/mod/mountain-world
- Owner
- KURONAMI
- Published
- 2026-05-29
- Updated on Modrinth
- 2026-05-29
- Facts verified
- 2026-10-15