which river flows north
Or perhaps that's because so many other rivers in Oregon flow north: the Deschutes, the John Day, and the Hood. Even the Oregon portion of the Snake flows north. I do understand that in Cairo the word on the street is that, except for the Willamette, the Nile is the only river in the world that flows north. Odd, since in Sudan for about 200 miles, the Nile River actually flows south.