The Mogollon Rim is a topographical and geological feature running across the U.S. state of Arizona. It extends approximately 200 miles (320 km) 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, namely the Kaibab Limestone and Coconino Sandstone. It was formed by erosion and faulting, and dramatic canyons have been cut into it, including Fossil Creek Canyon and Pine Canyon. The name Mogollon comes from Don Juan Ignacio Flores Mogollón, the Spanish Governor of New Mexico from 1712 to 1715.
Much of the land south of the Mogollon Rim lies 4000 to 5000 feet (1,200 to 1,500 meters) above sea level, with the escarpment rising to about 7,000 ft (2,100 m). Extensive Ponderosa Pine forests are found both on the slopes of the Rim and on the plateau north of it. The Mogollon Rim is a major floristic and faunal boundary, with species characteristic of the Rocky Mountains living on the top of the plateau, and species native to the Mexican Sierra Madre Occidental on the slopes below and in the Madrean sky islands (high, isolated mountain ranges) further south.