Saguaro National Park, located in southern Arizona

Arizona

Arizona ; is a state located in the southwestern region of the United States. It is also part of the western United States and the mountain west. The capital and largest city is Phoenix...

, is part of the United States National Park System.
The park is divided into two sections, called districts, lying approximately 20 miles (32.2 km) east and 15 miles (24.1 km) west of the center of the city of Tucson, Arizona

Tucson, Arizona

Tucson is a city in and the county seat of Pima County, Arizona, United States. The city is located 118 miles southeast of Phoenix and 60 miles north of the U.S.-Mexico border. The 2010 United States Census puts the city's population at 520,116 with a metropolitan area population at 1,020,200...

. The total area in 2010 was 91440 acres (37,004.5 ha) of which 70905 acres (28,694.3 ha) is designated wilderness

Wilderness

Wilderness or wildland is a natural environment on Earth that has not been significantly modified by human activity. It may also be defined as: "The most intact, undisturbed wild natural areas left on our planet—those last truly wild places that humans do not control and have not developed with...

. There is a visitor center in each of the two districts.