RiverInJungle

The mod generates large rivers inside jungle biomes as part of the landscape instead of placing a water channel on top of finished ground. Each river valley is carved the same way vanilla carves its rivers, giving a sloped bank, a sand or dirt bed and water up to sea level. Rivers are flat and low-lying, close to sea level, so the water pools in the lowland jungle and gives the wide, winding look of an Amazon-style waterway. Rivers that reach the coast empty straight into the sea, and where a river meets a lake or another low valley the transitions blend without visible joins.

Coastal jungles receive rivers where the ocean is nearby. High mountain jungles and small island jungles stay mostly dry, since flowing water cannot sit on a steep slope. Surface rules lay sand, dirt and grass along the water's edge and underwater just as they do for vanilla beaches and rivers. Fish that live in jungle water appear in the new channels, so the waterways feel populated. The mod is pure data-driven worldgen, adds no new blocks and needs no extra configuration. Terrain outside jungle biomes is left unchanged.

RiverInJungle is published for Fabric, Forge and NeoForge across 8 game versions, 1.19.2 – 26.3, and is released under the MIT License, which is not open source. It is server-side only, so players join without installing it.