During late April, I started a new project using Dunes' Crude River setup running into a few issues like not being able to get the water to appear properly and running into that sharp horizon line that seems to separate the distant mountains from the main flattish terrain.
Queried Ulco about these issues to which he came up with some great answers, especially the remedy for eliminating the sharp horizon via a SSS. Additionally. I liked the suggestion about increasing water transparency by resetting the Render node > right click > open Render subdiv settings 01 > Change the default Ray detail multiplier from default of 0.25 to 0.75. This can be adjusted to taste. And, it works beautifully.
In all, this project has been a great learning experience.
All vegetation models are by Walli; the fake stones/rocks file by dandelO; and, basic soils surface file is my Ryan Archer. Once again, I used the Moonlight Peak 514kb DEM file combined with a flattened Fractal terrain.
Render time was 71.15.39. Enjoy,
Bob