Badlands National Park (Lakota: Makȟóšiča[) is an American national park located in southwestern South Dakota. The park protects 242,756 acres (379.3 sq mi; 982.4 km2) of sharply eroded buttes and pinnacles, along with the largest undisturbed mixed grass prairie in the United States. The National Park Service manages the park, with the South Unit being co-managed with the Oglala Lakota tribe. Original public domain image from Flickr