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.
Marble Canyon is the section of the Colorado River canyon in northern Arizona from Lee’s Ferry to the confluence with the Little Colorado River, which marks the beginning of the Grand Canyon. Marble Canyon marks the western boundary of the Navajo Nation. In 1975, the former Marble Canyon National Monument, which followed the Colorado River northeast from the Grand Canyon to Lee’s Ferry, was made part of Grand Canyon National Park. The name Marble Canyon is a misnomer because there is no marble there. Although John Wesley Powell knew this when he named the canyon, he thought the polished limestone looked like marble. In his words, “The limestone of the canyon is often polished, and makes a beautiful marble. Sometimes the rocks are of many colors – white, gray, pink, and purple, with saffron tints.”