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Canyon de Chelly National Monument, established April 1, 1931 as a unit of the National Park Service, is located in northeastern Arizona, within the boundaries of the Navajo Nation. The monument covers 131 square miles and encompasses the floors and rims of the three major canyons: de Chelly, del Muerto, and Monument.
The name de Chelly is a Spanish corruption of the Navajo word Tsegi, which means roughly "rock canyon". The Spanish pronunciation "day shay-yee" has gradually changed through English usage, and the name is now pronounced/d'ʃeɪ/ ("d'SHAY"). Its 83,840 acres (339 km²), all nonfederal, preserve artifacts of the early indigenous tribes that lived in the area, including the Anasazi and Navajo.
Canyon de Chelly is unique among National Park service units, as it is comprised entirely of Navajo Tribal Trust Land that remains home to the canyon community. Access to the canyon floor is restricted, and visitors are allowed to travel in the canyons only when accompanied by a park ranger or an authorized Navajo guide. The only exception to this rule is the White House Ruin Trail. Most park visitors arrive by automobile and view Canyon de Chelly from the rim, following both North Rim Drive and South Rim Drive. Ancient ruins and geologic structures are visible, but in the distance, from turnoffs on each of these routes.
A spectacular geologic feature is Spider Rock, a sandstone spire that rises 800 feet from the canyon floor at the junction of Canyon de Chelly and Monument Canyon. Spider Rock can be seen from South Rim Drive. It has served as the scene of a number of television commercials.
Image:Canyon_de_Chelly1.jpg|White House Ruins (photo courtesy of USGS)
Image:Canyon_de_Chelly2.jpg|Spider Rock, (photo courtesy of USGS)
Image:Canyon de Chelly, Navajo.jpg|Canyon de Chelly, 1904, Edward S. Curtis photograph
![False-color Landsat 7 image of the canyon ([more information])](http://encycl.opentopia.com/enimages/thumb/1251/1250742/250px-CynDChelly_L7_2000-09-12.jpg "False-color Landsat 7 image of the canyon ([more information])")