The Tonto National Forest, encompassing 2,873,200 acres (1,162,700 ha), is the largest of the six national forests in Arizona and is the fifth largest national forest in the United States. The Tonto National Forest has diverse scenery, with elevations ranging from 1,400 feet (427 m) in the Sonoran Desert to 7,400 feet (2,256 m) in the ponderosa pine forests of the Mogollon Rim (pronounced MOH-gee-on, or MUH-gee-own). The Tonto National Forest is also the most visited "urban" forest in the United States. The boundaries of the Tonto National Forest are the Phoenix metropolitan area to the south, the Mogollon Rim to the north and the San Carlos and Fort Apache Indian Reservation to the east. The Tonto (Spanish for "fool") is managed by the USDA Forest Service and its headquarters are in Phoenix.