There are rivers but, as the scenery was totally remade it's possible some are missing in France - the focus is on the Battle of Britain currently.
Here's one in England
I think you posted in the forum too. There are some rivers in England at least where the focus is – it’s possible there are some not placed in France as the whole scenery was totally upgraded for WOTR. We also have not yet made Battle of France etc so have not focussed and expanded outwards into Europe fully. German fighters start on the coast mostly.
We are working on a Addon for WOFF currently, after that it’s possible we may upgrade or improve the scenery in WOTR – we shall see.
On the other question in your email...
WOTR and WOFF should not be in the same folder that will break both games. They can be in the same parent e.g.