Rapid City (Lakota: Mni Lúzaha Otúwahe; "Swift Water City") is the second-largest city in the State of South Dakota, and the county seat of Pennington County. Named after Rapid Creek on which the city is established, it is set against the eastern slope of the Black Hills mountain range. The population was 67,956 as of the 2017 Census. Rapid City is known as the "Gateway to the Black Hills" and the "City of Presidents". The city is split by a low mountain ridge that divides the western and eastern parts of the city. Ellsworth Air Force Base is located on the outskirts of the city. Camp Rapid, a part of the United States Army National Guard, is located in the western part of the city. The historic "old west" town of Deadwood is nearby. In the neighboring Black Hills are the popular tourist attractions of Mount Rushmore, the Crazy Horse Memorial, Custer State Park, and Wind Cave National Park.