I love the look of this map. HOWEVER, it looks like it needs port every 20 spaces along the river. One at every castle next to a river, and then one 20 spaces away or so in each direction. Otherwise, rivers can't be used to move troops along.
I agree with Jeremy, the lack of ports is really crippling for land based troop movements, especially as the Western lake near Whites capitol forces separation of land armies for almost half the length of the map, and the 3 center cities being so important yet are inaccessible by land units.