Rough draft please give feedback.

[Caenwyr]

I am not sure if the rivers are correct the seem a bit off to me.

I don't know, your rivers seem perfect to me! You're not making any of those beginners mistakes I've seen so often on this site. If I'd have to give a remark, I'd say they look a bit too... regular. Like straight/slightly curved lines with some random squiggles added to the mix to make 'em look a bit rougher. Real-world rivers tend to be a good bit more irregular, with sharp corners where any normal person would draw gentle curves. But that's just a really, really minor remark. I actually like your rivers a lot!