mountains

There's a L-shaped valley with mountains on both, desert mountains on both sides.

the mountains form a constriction.

And after talking with a single Army Colonel, Army Air Force Colonel, decided that the Desert Bighorn Sheep, who live in the mountains like Sheep Peak, for which it's named, and the mountains to the east, must be an endangered species.

This object remained for about 45 seconds or so before darting off over the mountains.