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Saguaro National Park is located in southern Arizona on the outskirts of Tucson and is a part of the United States National Park System. The park preserves the desert landscape, fauna and flora contained within two park sections, one east and the other west of Tucson. The park was established to protect its namesake—the giant saguaro cactus (Carnegiea gigantea). Saguaro in this park are near the northernmost limit of their natural survival zone within the Sonoran Desert.