Your rivers are mostly okay, if considered as highly symbolic, not exact routes. In a real world ( okay, from a sample size of ONE) most lakes either fill to overflow their basin, and continue on to the sea, or else they did that once upon a time and the resulting outflow cut a gap or canyon. Not many will totally dead-end.

That long east-west river in Aldeor will need hills or mountains all along the southern Aldeor coast, to be plausible. Also remember that since water flows downhill and that is a very long river, the eastern lake that is its source has to be fairly high altitude, necessitating even higher land around it. That can be made to work, you'll just need to pay attention to details.