Antelope Canyon is a "slot canyon" found near Page, Arizona, United States on Navajo land. Slot canyons are formed when water runs through cracks in rocks and creates channels.
In this case, flash floods and rain created two separate channels, referred to as "The Crack" (Upper Antelope Canyon) and "The Corkscrew" (Lower Antelope Canyon).
The Crack is the most visited due to its flat topography and it's sandstone walls that are often illuminated by the sun. It is a flat 183 meter stretch. The Corkscrew is less popular due to its challenging terrain and less visually appealing landscape. Visitors must climb down into the lower section using built in ladders and stairs, and less sun reaches it. The Corkscrew is over 800 meters long and contains spiral rock arches.
Neither section of Antelope Canyon can be accessed by the general public freely. In order to visit the Canyon, individuals must be guided by a trained professional from the Navajo Tribe. This is due to the danger of flash floods during monsoon season. Rain does not have to fall on or near the Canyon for flash flooding to occur. Rain falling from many miles away can funnel into the Canyon without notice or expectation. Precautions have been taken inside the Canyon to ensure visitor safety, including alarms horns, safety nets, and secure ladders.