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Regions Unexplored supports both Fabric and NeoForge mod loaders for Minecraft 1.21.1. Follow the installation steps for your preferred loader below.

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Prerequisites

Minecraft 1.21.1

Java Edition required

Mod loader

Fabric 0.18.4+ or NeoForge 21.1.218+
Regions Unexplored requires Biolith and Lithostitched as dependencies. Both must be installed for the mod to function properly.

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Installation steps

1

Install Fabric Loader

Download and run the Fabric installer for Minecraft 1.21.1.Select:
  • Minecraft Version: 1.21.1
  • Loader Version: 0.18.4 or higher
  • Installation Location: Your default Minecraft directory
Click “Install” to set up the Fabric profile.
2

Install Fabric API

Fabric API is required for Regions Unexplored to run.Download Fabric API 0.116.8+ for Minecraft 1.21.1 and place it in your mods folder.
The mods folder is located at:
  • Windows: %APPDATA%\.minecraft\mods
  • macOS: ~/Library/Application Support/minecraft/mods
  • Linux: ~/.minecraft/mods
3

Install dependencies

Download and install the required dependencies in your mods folder:
# Biolith (biome placement library)
# Version: 3.0.10 or higher for Fabric
https://modrinth.com/mod/biolith

# Lithostitched (worldgen framework)
# Version: 1.5.7-fabric-1.21.1 or higher
https://modrinth.com/mod/lithostitched
Both dependencies are available on Modrinth and CurseForge.
4

Install Regions Unexplored

Download the latest Fabric version of Regions Unexplored from:Place the .jar file in your mods folder.Your mods folder should now contain:
  • fabric-api-*.jar
  • biolith-fabric-*.jar
  • lithostitched-*-fabric-*.jar
  • regions_unexplored-*-fabric.jar
5

Launch Minecraft

Start the Minecraft Launcher and select the Fabric profile. Launch the game.
First launch may take longer as Minecraft generates the mod configuration files and caches.
Create a new world to experience Regions Unexplored biomes. Existing worlds will only generate new biomes in unexplored chunks.
6

Optional: Install Mod Menu (recommended)

For easier mod configuration, install Mod Menu.Regions Unexplored integrates with Mod Menu to provide in-game configuration screens for client and common settings.
Optional enhancement
# Mod Menu 11.0.3 or higher
https://modrinth.com/mod/modmenu

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Server installation

To run Regions Unexplored on a server:
1

Install the server software

Download and set up either:
2

Add the mods

Place the following in your server’s mods folder:
  • Regions Unexplored (same version as clients)
  • Biolith (matching loader version)
  • Lithostitched (matching loader version)
  • Fabric API (Fabric servers only)
3

Generate new world

For best results, start with a fresh world. Adding Regions Unexplored to existing worlds will only generate new biomes in unexplored chunks.
Delete the existing world folder (after backing up!) or change the level-name in server.properties to generate a new world with all biomes.
4

Configure and launch

Adjust settings in the config files located at:
config/regions unexplored/regions_unexplored-common.toml
Start your server with the appropriate launch script.

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Troubleshooting

Possible causes:
  • Missing dependencies (Biolith or Lithostitched)
  • Wrong mod loader version (Fabric mod on NeoForge or vice versa)
  • Incompatible Minecraft version
Solutions:
  • Check that all dependencies are installed
  • Verify you downloaded the correct loader version
  • Ensure all mods are for Minecraft 1.21.1
  • Check the crash log in crash-reports folder for specific errors
Solutions:
  • Create a new world - existing worlds only generate new biomes in unexplored areas
  • Use /locatebiome regions_unexplored: commands to find specific biomes
  • Check that Biolith is properly installed (it handles biome placement)
  • Verify configuration files haven’t disabled biome generation
Some worldgen mods may conflict with Regions Unexplored. See the compatibility guide for known issues and solutions.If you encounter conflicts:
  • Test with only Regions Unexplored and its dependencies
  • Add other mods one at a time to identify conflicts
  • Check configuration options for biome placement settings
Optimization tips:
  • Install performance mods like Sodium (Fabric) or Embeddium (NeoForge)
  • Reduce render distance in video settings
  • Allocate more RAM to Minecraft (4-6GB recommended)
  • Disable particle effects in settings if needed

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Next steps

Compatibility

Check compatibility with other popular mods

Report issues

Found a problem? Report it on GitHub

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