CurseForge · Minecraft mod
Regions Unexplored: Expansion
Remodels vanilla biomes to match the look of Regions Unexplored biomes
Quick answer
Which Regions Unexplored: Expansion release should I use?
Regions Unexplored: Expansion RUExpansion-1.0.1+1.21.1.jar targets 1.21.1 with Fabric, NeoForge, Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is Regions Unexplored: Expansion required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Regions Unexplored: Expansion RUExpansion-1.0.1+1.21.1.jar need?
RUExpansion-1.0.1+1.21.1.jar. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Regions Unexplored: Expansion without breaking your instance.
Built for Regions Unexplored: Expansion RUExpansion-1.0.1+1.21.1.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use RUExpansion-1.0.1+1.21.1.jar. It targets 1.21.1 with Fabric, NeoForge, Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside RUExpansion-1.0.1+1.21.1.jar. It opens that exact file at the source.
About this project
What does Regions Unexplored: Expansion add?

Have you ever played a modpack with Regions Unexplored, but been bothered by how bland vanilla biomes looked in comparison? With this addon, most vanilla Overworld surface biomes will be brought up to par with with Regions Unexplored biomes. You will be able to find blocks, plants, and other features from Regions Unexplored in many vanilla biomes. Check out the gallery if you want too see a sample of this mod/datapack's vanilla biome overhauls.
Currently this mod only supports Regions Unexplored for 1.20.1, but support for other versions may be added in the future. This mod/datapack has so far only been tested for compatibility with Regions Unexplored, so I cannot guarantee compatibility with any other biome mods.
Feel free to use this mod/datapack in any modpack.
Credit to @.mo_mo from the Regions Unexplored Discord server and ebo2022 from Curseforge for their earlier work that this mod and data pack were based on.
Project description from CurseForge.
Pick your setup
Regions Unexplored: Expansion by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.20.1
4 loader buildsCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Regions Unexplored: Expansion versions and loaders
RUExpansion-1.0.1+1.21.1.jar
13 Aug 2025
RUExpansion-1.0.1+1.20.1.jar
21 Jun 2025
RUVanillaBiomes-1.0.0+1.20.1.jar
16 Jun 2025
Looking for an older file? The official CurseForge project page is in Resources.