RiverInJungle

Adds wide, natural-looking rivers that generate as a real part of the terrain inside jungle biomes. Instead of placing a channel on top of finished ground, the river valleys are carved into the world the same way vanilla makes its rivers — so you get a proper sunken riverbed, sand and dirt banks, water filled to sea level, and clean merges wherever a river runs into the ocean or into another biome. Big, Amazon-style waterways that look like they were always meant to be there.

Install on the server (or in singleplayer) — client installation is optional. River generation is server-side worldgen, so vanilla clients can connect and explore the rivers with no extra setup.

Dependencies: Fabric needs Fabric API and Architectury API. NeoForge needs Architectury API. Forge needs no additional dependencies.

Free to use in any modpack — public or private, no permission needed.

What it does

• Real terrain rivers — river valleys are part of the landscape itself: carved bed, sloped banks, water at sea level. No floating grass, no exposed-stone trenches, no artificial channels.
• Wide & winding — a flat-bottomed, wide profile makes them read as large waterways you can canoe down and spot from a distance, not thin ditches.
• Seamless merges — where a river reaches the coast it flows straight into the sea; where it meets a lake or low valley it blends in with no walls or seams.
• Natural banks — surface rules lay sand and dirt along the water's edge (no grass underwater), just like vanilla rivers and beaches.
• Jungle wildlife — tropical fish and salmon spawn in jungle water, so the rivers feel populated.
• Vanilla-faithful & lightweight — pure data-driven worldgen: no new blocks, no config, and zero changes to non-jungle terrain.

Where rivers appear: wide rivers form in flat, low-lying jungle near sea level, where water can actually pool — that's where you get the full Amazon look. Coastal jungle gets rivers that empty into the ocean. High mountain jungle and small jungle islands stay mostly dry, because flowing water can't sit perched on a slope — the same rule vanilla rivers follow.

Details

• New chunks only — already-explored jungle won't change. Travel to fresh terrain or start a new world to see the rivers. Everything outside jungle climate stays identical to vanilla.
• Removing the mod — already-generated rivers remain as ordinary terrain; only future generation stops.
• FlatSavanna — both mods replace the same terrain-height file, so only one of them takes effect: you get either the jungle rivers or FlatSavanna's lowered savanna hills.
• Experimental Settings screen — on some versions the game treats custom worldgen as experimental and asks when you open a world. Hit Proceed.

Feedback

Please report any bugs, errors, or feature suggestions on Discord: https://discord.gg/HTkn94BXmA

More mods by Nikrecs: Fields · Better Caravans

My other mods that I recommend.