Antelope Canyon is a slot canyon in the American Southwest. It is located on Navajo land east of Page, Arizona. Antelope Canyon includes two separate, scenic slot canyon sections, referred to individually as "Upper Antelope Canyon" or "The Crack"; and "Antelope Canyon" or "The Corkscrew”. The Canyon was formed by erosion of Navajo Sandstone, primarily due to flash flooding. Rainwater, especially during monsoon season, runs into the extensive basin above the slot canyon sections, picking up sand as it rushes into the narrow passageways. Over time the passageways eroded away, making the corridors deeper and smoothing hard edges in such a way as to form flowing shapes and lines in the rock.