After some weeks (only partially successful) render time for my canyon animations, I tackled the thing differently.
The terrain with 100 km² is just too big to get one perfect flight through the canyon.
Too much populations and detail work necessary and even my core i7 feels sick while working on the terrain

Last week a friend asked, why I don't play batman anymore with the new PC and I told him "I planted 5 million grass"
- yes - in this grammatically wrong way ... sounds sooo funny - even in German language

I will need to do smaller areas and shorter scenes.
... and so I found nice new details, new solutions --- and this nice little mountain lake on the tableau above the river:
[attach=1]
Here is the view when you have almost arrived at the lake:
[attach=2]
And here you can get a little imagination how big the terrain is:
This weekend I will modify some of the pop-rocks. I don't like direction size and the look of some of them and learned last days that you can modify single objects of a population...
[attach=3]
Here is what I did the last 3 weeks... i like the sunrise but I will have to work on it... still not satisfied. And I am little proud on the water movement but I will change some details.