While not in technical violation it does violate logic. If you were to think about the actual height of the land then that valley would close up on the right side forcing the river to the west-northwest. To prevent that the land in that area would have to be higher than the end of the valley but since it is near a coast that isn't very likely. If there were some big hills there or maybe put some more space at the end of the valley on the right. At any rate, looks pretty good otherwise.