Antelope Canyon is the most-visited and most-photographed slot canyon in the American Southwest It is located on Navajo land near Arizona. Antelope Canyon includes two separate, photogenic slot canyon sections, referred to individually as Upper Antelope Canyon or The Crack; and Lower Antelope Canyon or The Corkscrew. The Navajo name for Upper Antelope Canyon is Tsé bighánílíní, which means "the place where water runs through rocks." Lower Antelope Canyon is Hazdistazí or "spiral rock arches." Both are located within the LeChee Chapter of the Navajo Nation.
Antelope Canyon was formed by erosion of Navajo Sandstone, primarily due to flash flooding and secondarily due to other sub-aerial processes. Rainwater, especially during monsoon season, runs into the extensive basin above the slot canyon sections, picking up speed and sand as it rushes into the narrow passageways. Over time the passageways are eroded away, making the corridors deeper and smoothing hard edges in such a way as to form characteristic 'flowing' shapes in the rock.
Flooding in the canyon still occurs. A flood occurred on October 30, 2006 that lasted 36 hours, and caused the Tribal Park Authorities to close Lower Antelope Canyon for five months. Antelope Canyon is a popular location for photographers and sightseers, and a source of tourism business for the Navajo Nation. It has been accessible by permit only since 1997, when the Navajo Tribe made it a Navajo Tribal Park. Photography within the canyons is difficult due to the wide exposure range made by light reflecting off the canyon walls.