The Mogollon Rim is a topographical and geological feature running across the U.S. state of Arizona. It extends approximately 200 miles from northern Yavapai County eastward to near the border with New Mexico. The Rim is an escarpment defining the southwestern edge of the Colorado Plateau, and along its central and most spectacular portions is characterized by high limestone and sandstone cliffs. It was formed by erosion and faulting, and dramatic canyons have been cut into it, including Fossil Creek Canyon and Pine Canyon.
Much of the land south of the Mogollon Rim lies 4000 to 5000 feet above sea level, with the escarpment rising to about 7,000 ft.
That's Christopher Creek and AZ260 highway near the bottom. Seen inbound to Phoenix.