Definitely some river violations. Keep in mind that (except for deltas which are a special case) rivers join as they go toward the sea and almost never split. To steal a metaphor from Ascension, think of the river as a tree with its "trunk" at the ocean, and its branches spreading into the mountains. I'd agree with thebax2k that some of the labels don't stand out (I didn't even see the island ones he mentions), although I think color changes would do if you like the font. I'd also recommend softening the edge where ocean meets land a bit, it's very sharp and a bit distracting. The mountains look fantastic, nice use of pasis's tut there