ModsJava
Underground Rivers
Rivers, but underground! Wild, isn't it?. Free Minecraft Java mod for 1.21.1, 1.21.11, 1.21.7.
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
Underground Rivers
Underground Rivers is a worldgen mod that adds underground rivers to your world.
Description
Tectonic has underground rivers as a feature, but this mod adds them to vanilla terrain with no other changes. They're a complete rewrite from the ground up, meaning there's better entrances and more variation then ever before!
Underground Rivers relies on the Lithostitched mod for compatibility purposes, making the mod work with other worldgen mods like Biomes O Plenty, Nature's Spirit, and even Terralith!
Verified by MCModsHub
- Ships as underground-rivers-1.0.1-forge-1.20.1.jar — drop this file into the mods folder
- Download size: 40 KB
- Download link checked 27 Aug 2026 — working
These come from our own check of the pack file, not from the source page.