This is a procedural realistic river generating tool made in Blender 3D. It can be used both in Cycles and Eevee well. Enjoy:>
BLEND (Blender, filesize: 81.1 MB), OBJ (OBJ, filesize: 39.5 MB), FBX (Autodesk FBX, filesize: 7.37 MB), GLTF (glTF, filesize: 392 Bytes), DAE (Collada, filesize: 3.37 KB), PDF (PDF, filesize: 1.23 KB), ABC (Alembic, filesize: 8.2 KB), STL (Stereolithography, filesize: 17.3 MB)