Monument Valley (Navajo: Tsé Biiʼ Ndzisgaii, pronounced [tsʰépìːʔntsɪ̀skɑ̀ìː], meaning valley of the rocks) is a region of the Colorado Plateau characterized by a cluster of vast sandstone buttes, the largest reaching 1,000 ft (300 m) above the valley floor. It is located on the Arizona–Utah border (around 36°59′N 110°6′W / 36. 983°N 110. 100°W / 36. 983; -110. 100Coordinates: 36°59′N 110°6′W / 36. 983°N 110. 100°W / 36. 983; -110. 100), near the Four Corners area. The valley lies within the territory of the Navajo Nation Reservation and is accessible from U. S. Highway 163.