Downhill Rivers
by Tugs
Downhill Rivers changes terrain generation so that rivers run across the overworld, flowing downhill with curves and banks shaped by Lithostitched.
What it does
Rivers are generated as part of the overworld terrain, so new worlds get streams that follow the slope of the land instead of sitting flat. The river generation is built on Lithostitched, which must be installed alongside the mod, and that dependency is the only one the mod needs.
Most of the behavior can be adjusted in the configuration file. Curviness and amplitude control how much a river bends and how far it swings, while the width of the river and the riverbank width set the channel. The riverbank block palette and the biomes where banks spawn can also be changed, so the look of the shoreline can be matched to a world.
The mod runs on NeoForge for Minecraft 1.21.1 only. It is server-side only, so players join without installing it, and the server owner sets the look of rivers for everyone on it. Downhill Rivers is not open source and is released under All rights reserved. Files were first published on 2026-06-13 and the latest NeoForge build, 1.0.0.3, followed on 2026-07-02.
Key features
Downhill river streams
Rivers flow downhill across the overworld terrain, so streams follow the shape of the land.
Curve and amplitude settings
The config controls how much rivers bend and swing, letting server owners tune the winding of each stream.
Width and riverbank options
River width and riverbank width are both configurable, along with the block palette and biomes where the banks appear.
Lithostitched-based placement
River placement uses Lithostitched, so generation is handled through that library's world placement system.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Server owners who run NeoForge 1.21.1 and want rivers that follow the slope of the terrain. Players only need to join the server, since the mod is server-side only.
Questions
Does Downhill Rivers need another mod to run?
Do players need the mod installed on their game?
Can the river shape be changed?
Which loaders and versions does the mod support?
In the catalog
Downhill Rivers is one of 8,515 World generation mods on ModsFinder, and one of 4,175 World generation mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from Tugs
Similar mods
What the author says
This mod adds rivers that generate across the overworld using lithostitched.\ \ All screenshots in the gallery use the following mods:\ DistantHorizons-3.0.3-b-1.21.1-fabric-neoforge\ lithostitched-1.7.9-neoforge-21.1\ middgard-1.2.1-1.21.1\ Oh-The-Trees-Youll-Grow-neoforge-1.21.1-5.3.2\…
Official listing
- Modrinth page
- modrinth.com/mod/downhill-rivers
- Owner
- Tugs
- Published
- 2026-06-13
- Updated on Modrinth
- 2026-07-02
- Facts verified
- 2026-10-15