Thank you Viking! I'm aware of the rivers. The map is an update from an older map I made with faulty rivers. I'm slowly updating part of the maps and recreating the rivers. Some rivers (mostly on the east and north side of the map) are very wide. These are the old rivers. The rivers at the soutwest are updated.
That forest with a straight border is waiting for a mountainrange just north of it. I will blend the forest with the mountains in some time