Forgotten Chunks
by Gustavo2032
Forgotten Chunks is a Fabric world generation mod that removes unused chunks from region files so the world regenerates them later.
What it does
Chunks where a player breaks or places blocks, uses items, interacts with blocks or attacks blocks are marked permanently protected and are never deleted. Chunks near protected structures, near players and chunks currently loaded are also kept. Chunks that nobody has touched enter an automatic cleanup queue, and their chunk data is removed from the .mca region files. When an area is visited again, Minecraft regenerates the chunk from the world seed, so exploration can continue without the save file growing.
The mod is aimed at long-term survival worlds, exploration-focused play and servers with storage limits. It changes files on disk directly, so the author advises backing up important worlds before installing it. It needs Fabric Loader, Fabric API and Java 21, and it runs on Minecraft 1.21.11. Files are published for Fabric across 12 release versions, 1.21 – 1.21.11, and the latest file is 1.1.0 for 1.21.11, released under the MIT License but not open source.
Key features
Permanent protection
Chunks where players interact with the world are marked as permanently protected and stay in the save.
Automatic cleanup queue
Abandoned chunks join a queue and are removed from region files without any manual step.
Regeneration from seed
Removed chunks come back with terrain generated from the world seed when an area is visited again.
Protected neighbourhoods
Chunks near protected structures, near players and loaded chunks are excluded from cleanup.
Compatibility
Latest build for each game version and loader.
1.21.x12 of 12 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners and players who run long-term survival or exploration worlds and want the save file to stay a manageable size. The mod is not intended for worlds that have not been backed up.
How it compares
Regenerate Chunks is a Fabric mod for 1.21 – 26.1.2, server-side only and open source under the MIT License, so it covers a wider version range than Forgotten Chunks. No Chunk Loading Ender Pearls is a Fabric mod for 1.21.2 – 1.21.4 that needs both client and server, licensed under Creative Commons Attribution 4.0 and not open source. Regma/Regenerating Magma is a client and server mod for 1.21.11 only, licensed under CC0 1.0 Universal and open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Forgotten Chunks | Fabric | 1.21 – 1.21.11 | Server-side only | 2026-05-19 |
| Regenerate Chunks | Fabric | 1.21 – 26.1.2 | Server-side only | 2026-05-13 |
| No Chunk Loading Ender Pearls | Fabric | 1.21.2 – 1.21.4 | Client and server | 2025-01-09 |
| Regma/Regenerating Magma | Fabric | 1.21.11 | Client and server | 2026-09-07 |
Questions
Does Forgotten Chunks need to be installed on the client?
What does Forgotten Chunks require?
Is it safe to use on an existing world?
In the catalog
Forgotten Chunks is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
Forgotten Chunks is a Fabric mod that creates a dynamic, self-regenerating world system for Minecraft. Every chunk where the player interacts is marked as permanent and protected.
Official listing
- Modrinth page
- modrinth.com/mod/forgotten-chunks
- Owner
- Gustavo2032
- Published
- 2026-05-11
- Updated on Modrinth
- 2026-05-19
- Facts verified
- 2026-10-15