Underground Rivers
Rivers, but underground! Wild, isn't it?
Screenshots
About this Mod
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!
Available Versions
How to Install Underground Rivers on Your Server
Order Server
Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (26.1).
Install Mod
Open the mod browser in the dashboard and search for "Underground Rivers". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
26.1, 1.21.11, 1.21.7 (+8 more)
Server-side
✓ RequiredRecommended RAM
6 GB(min. 4 GB)Frequently Asked Questions
Underground Rivers server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 4 GB RAM is allocated and the loader matches the mod version (26.1). You can switch loaders with one click in the panel.
Is Underground Rivers compatible with fabric and forge and neoforge?
Underground Rivers officially supports fabric, forge, neoforge for Minecraft 26.1, 1.21.11, 1.21.7. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Underground Rivers – how to optimize performance?
Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Underground Rivers consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Underground Rivers with just one click on your server.