canyon 0.4.2 by paramat
For Minetest 0.4.12 and later
Depends default bucket
Licenses: Code WTFPL, textures CC BY-SA 3.0

Designed for mgv6 but also produces interesting results in other mapgens.
Creates a worldwide river system of freshwater with varying water surface height.
Freshwater is bucketable. It has a flow range of 2 nodes and is non-renewable to hold it's shape on steep river sections.