The San Francisco Peaks are a volcanic mountain range located in north central Arizona, just north of Flagstaff. The highest summit in the range, Humphreys Peak, is the highest point in the state of Arizona at 12,633 feet (3,851 m) in elevation. The San Francisco Peaks are the remains of an eroded stratovolcano. An aquifer within the caldera supplies much of Flagstaff's water while the mountain itself is located within the Coconino National Forest and is a popular site for outdoor recreation.