I know I'm not the river police but I did notice something. In the southwestern part of the eastern landmass, across from the mountain penisula of the desert area, you have a river that is headind towards the sea but breaks off at the last minute and head a bit inland before exiting further down the coast. This might not be a violation, I'm no expert, but it does look a little strange. Also, to the east of that river, a small river joins into/breaks off from the main river that runs along the mountains, it just looks a little out of place.
They're are also some little personal nit-picky things I've noticed but they don't really matter and I don't quite have a lot of time right now.
But all in all great work, really looks like a satelite image. Bravo.
It has probably been mentioned before but I the borders. They're beautiful and decortaive and they don't draw attention away from the map whilst looking great. Who do you do them, my attempts have been quite basic so far.