The park is divided into two sections, called districts, lying approximately 20 miles 32 km east and 24 km west of the center of the city of Tucson, Arizona. The total area in 2010 was 91,440 acres of which 70,905 acres are designated wilderness. There is a visitor center in each of the two districts. Both are easily reached by car from Tucson, but there is no public transport into the park. Both districts conserve fine tracts of the Sonoran Desert, including ranges of significant hills, the Tucson Mountains in the west and the Rincon Mountains in the east. Organ Pipe Cactus National Monument