Arch Canyon, on the west side of the Ajo Range in Organ Pipe Cactus National Monument is named for a 90 foot wide arch near the top of the jagged, reddish cliffs enclosing the drainage, about 600 feet above the valley floor. Close inspection reveals a separate, much smaller opening above the main span, making this a rare example of a double arch.
Chollas and Organ Pipe Cacti on the rocky slopes of the Ajo Mountain Range in Organ Pipe Cactus National Monument, Arizona, USA
Saguaros and Organ Pipe Cacti on the rocky slopes of the Ajo Mountain Range in Organ Pipe Cactus National Monument, Arizona, USA
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