Organ Pipe Cactus: Round 2

One of the most interesting comparisons on this trip was between Arizona’s Organ Pipe Cactus National Monument and its sister park, Sonora’s El Pinacate y Gran Desierto de Altar Biosphere Reserve. Despite being separated by only about 50 kilometers, both parks are incredibly unique in their own ways, but you can definitely see common features, especially from a geological point-of-view.