The Upper Granite Gorge is what most people think of when they hear about being down in the Grand Canyon.
The river in this section is mostly fast water with occasional small riffles and a few large rapids.
The river looks like it's tilted. And it is. This may be exaggerated by being tossed around while I was taking the photograph. But sitting there, you can see that the river slopes downhill. It looks just like it would if you were going down a ramp. You can also see the surface of the river tilting to the right or left as it roars around bends.