Black Mountain is a lava capped mesa in Pima County, Arizona, that rises 1,000 feet above its base to an altitude of 3,700 feet (1,128 m). It is a northeast trending ridge, 5,600 feet in length, located along Mission Road nine miles southwest of Tucson. It is on the San Xavier Indian Reservation, 3.18 miles southwest of the Mission San Xavier del Bac.[3][4] The Sierrita Mountains rise to the southwest and the Santa Cruz River is about four miles to the east.[4]