Agathla Peak, Volcanic summit in Navajo County, Arizona, US.

Agathla Peak is an eroded volcanic plug of volcanic breccia cut by dikes of minette, rising 1,500 feet (460 m) above the surrounding terrain to an elevation of 2,164 m. It stands 7 miles (11 km) north of Kayenta and is visible from U.S. Route 163.

The first recorded ascent took place on May 29, 1949, when Ray Garner, Herb Conn and Lee Pedrick climbed the 550-foot West Face route (class 5.8). They hauled over 70 pounds of gear, including 50 pitons, 40 tamp-in bolts, four 120-foot nylon ropes and twelve quarts of water, and spent the night on the summit before descending.

The Navajo name Aghaałą́ means 'much wool', said to come from antelope and deer fur collecting on the rock. The peak is sacred to the Navajo, and the Spanish name El Capitan is also used for it.

The mountain sits roughly 7 miles north of Kayenta and is clearly visible from U.S. Route 163. Climbing activities are currently restricted due to Navajo Nation regulations, so verify local conditions before planning a visit.

Agathla Peak and Shiprock in New Mexico are the most prominent of the volcanic diatremes in the Navajo Volcanic Field. The minette dikes cutting the breccia are about 25 million years old, and the peak's Navajo name, aghaałą́, means 'much wool', said to refer to antelope and deer fur caught on the rock.