I join the compliments so far for the way the river is drawn. Really well done.
If I may add my 2 cents I have some problems with the "third dimension" (read: elevation) of the map. The cliffs and the river are in my opinion not interacting correctly. At each cliff passed by the river, a nearby "gap" in the cliff is present. This (should) mean that an easier way for the water to go is available (the cliff will be less steep compared to the nearby ground where a cliff between the two levels is not formed) and my eyes are seeing the actual path as a little strange due to this.

Anyway, very nice map!