The Grand Wash Cliffs are the western, specifically the southwestern perimeter, of the Colorado Plateau; the section of the plateau is called the Haulapai Plateau-(the Hualapai extends east to the Aubrey Cliffs), from eastern Lake Mead at Grapevine Mesa to the Flagstaff, Arizona region (east about 150-mi), where the San Francisco volcanic field has numerous volcanic forms. The Coconino Plateau does continue southwards and also ends at cliffs: the Mogollon Rim cliffs, at the south edge of the sub-plateau called the Mogollon Plateau. (The drainage is north from there into the Painted Desert, part of the drainage into the Little Colorado River which enters the beginning of the Grand Canyon, at the Colorado River.)