Monument Valley (Navajo:valley of the rocks) is a region of the Colorado Plateau characterized by a cluster of vast sandstone buttes, the largest reaching 1,000 feet above the valley floor. It is located on the Arizona–Utah state line, near the Four Corners area. The valley lies within the territory of the Navajo Nation Reservation and is accessible from U.S. Highway 163. Monument Valley has been featured in many forms of media since the 1930s. Director John Ford used the location for a number of his best-known films.