highest point (12,633 feet 【3,851 metres】) in Arizona, U.S., 10 miles (16 km) north of Flagstaff on the Colorado Plateau. Humphreys Peak is one of the three San Francisco Peaks on the rim of an eroded volcano. It is situated within the Coconino National Forest and was named for Andrew Humphreys, a 19th-century officer of the U.S. Army Corps of Engineers.