The scars from the movement of water are probably not apparent on the ground but from 30,000 feet they stand out readily. Larger arteries divide up into smaller branches and empty into one, large wash in the middle. The word wash seems appropriate given that water was involved and is involved in the watercolor painting process that uses the same word and produces a similar visual effect. This is the Pinto Basin in Eastern California.
Note: there was ice on the window and you can see it in the bottom of the image. Also, I bumped up the contrast some here to get it closer to the way it looked to my eye.