By Linda Tancs
Organ Pipe Cactus National Monument is a U.S. national monument and UNESCO biosphere reserve located in extreme southern Arizona that shares a border with the Mexican state of Sonora. Organ pipe cactus is named for its tall, cylindrical stems that grow in clusters, resembling the pipes of a church organ. Senita cactus is sometimes confused with organ pipe and is also found in certain places within the national monument. The park is the only place in the United States where senita and organ pipe cactus grow wild. Come for a wilderness hike, a scenic drive or a night of camping.
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