That's a very appealing map. Nice colours, distribution, and overall shape of the territory.

As far as rivers goes, I'll have to echo S0meguy: The way the Everflow, Rhone, Clearwash and Blightwash rivers interact would be impossible unless there is some kind of supernatural force at work (or the whole territory is extremely flat and gets tidal floods creating canals!). Always remember water seeks the route of less resistance on its way to the lowest point, so unless some very specific circumstances take place, they don't split up (and when they do, it is usually for short distances or creating small islands).

But you have a very good thing going on there.