(Patch 78)
Thanks, I'll try that. I'll be looking to see if the segments can be made to merge.
I did notice that in this edition the rivers are above ground with the riverbanks unpainted.
Here are a couple of (jpg) things to watch out for, especially in-game.
When I drop a bridge across the river, or set a radar tower next to it, they are hidden where they intersect.
I built a quick terrain with the Alps, then threw a river into it. The river shows through the mountains.