King Arthur Castle is a 7,344-foot-elevation (2,238 meter) summit located in the Grand Canyon, in Coconino County of northern Arizona, US. It is situated one-half mile northwest of Guinevere Castle, one mile west of Excalibur, and two miles east-southeast of Holy Grail Temple, within the Shinumo Amphitheater. Topographic relief is significant as it rises over 5,100 feet (1,555 meters) above the Colorado River in 4.5 miles (7.2 km). According to the Köppen climate classification system, King Arthur Castle is located in a cold semi-arid climate zone, with precipitation runoff draining west to the Colorado River via Shinumo Creek.