A comb ridge is a sharp mountain crest eroded by glaciers or water to look jagged, saw-toothed. Because of the pinnacles and notches along its crest, a comb ridge—the expression is often used interchangeably with arête—resembles a rooster’s comb. It is the acute and rugged divide between two aggressive glacial arenas. In the dryland west, a comb ridge is a single fold of upturned rock that has sharp teeth cut by water erosion. An example is Comb Ridge, near Bluff, Utah. Other comb ridges can be seen in Grand Staircase–Escalante National Monument, Utah.