Monument Valley is a region of the Colorado Plateau characterized by a cluster of sandstone buttes, the largest reaching 1,000 ft above the valley floor. It is located on the Utah-Arizona state line, near the Four Corners area. The valley is a sacred area that lies within the territory of the Navajo Nation Reservation, the Native American people of the area. Monument Valley has been featured in many forms of media since the 1930s. Director John Ford used the location for a number of his Westerns; critic Keith Phipps wrote that “its five square miles [13 square kilometers] have defined what decades of moviegoers think of when they imagine the American West.