Well, if you're taking critiques:
The river Phayus looks a bit different depending on what map you look at.
http://www.rscottbakker.com/fan-resources/The older one (zoomed into Kian) has it flow north of Mehtsonc a bit more and it splinters into more tributaries.
I think the way you have it probably a fair representation of it (more updated maps show it head east as you've shown), but adding a few more smaller tributaries flowing down from the mountains might also fit in. Did you consider it?
I think Kellhus' journey leads him to a mountain pass somewhere near the battle of Kiyuth and they end up hitting a couple streams as they flee to Momemn. I'm not sure the way you have it drawn currently would capture that... Maybe I'm wrong though. I've never really figured out exactly where they cross or counted how many streams they passed.
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And since I'm a greedy person, how about holy Shimeh? We've got a map of that. Have you considered doing a smaller one of that city? I'm about 85% certain that I'm going to print the big earwa map out and hang it, and I think a map of the city would look great next to it...
Wow, Somna, awesome. So we DO know who will make all the detail maps for our upcoming p&p RPG... (only half-joking!)
(not joking at all is more like it)