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Organ Pipe cactus and double arches at Arch Canyon, Ajo Mountains, Organ Pipe Cactus National Monument, Ariz.
©Tom & Pat Leeson
Organ Pipe Cactus National Monument, Arizona, Arch Canyon, Ajo Mountains, Ajo Mountain Range, Ajo Mountain Drive, desert, Sonoran Desert, desert, UNESCO biosphere reserve, Biosphere Reserve, Organ Pipe cactus, Organ Pipe, organpipe cactus, Stenocereus thurberi, saguaro cactus, Carnegiea gigantea, cactus, cacti, scenic, landscape, leesonphoto, horizontal, rock arches