Est. 1939 · Oglala Lakota Homeland · 1890 Ghost Dance Movement Context · Oligocene Fossil Beds · Oglala Sioux Co-Management Agreement · Mixed-Grass Prairie Wilderness
The badlands of southwestern South Dakota have been called mako sica by the Lakota people for centuries — literally land bad, a reference to the extreme summer temperatures, the absence of surface water, and the difficulty of traversing the eroded buttes and gullies. Early French trappers translated the Lakota term as les mauvaises terres à traverser, and the English shortening produced the modern name.
The region has supported human occupation for approximately 11,000 years. The Lakota, who arrived in the broader Great Plains in the early 1700s following migration from the Great Lakes region, used the badlands as winter shelter, hunting territory, and as the geographic context for several defining events in late 19th-century Plains history. The Oglala Lakota in particular maintain continuing cultural and spiritual relationships with specific places within and around the modern park boundary.
The paleontological significance of the Badlands was recognized in the mid-19th century, with fossil collectors and academic teams documenting one of the richest known beds of Oligocene mammal fossils. Specimens from the Badlands form important holdings in the Smithsonian, the American Museum of Natural History, and major American university paleontology collections. The fossil record covers approximately 33 million years and includes early horses, oreodonts, saber-toothed cats, and titanotheres.
On March 4, 1929 — his final full day in office — President Calvin Coolidge signed Public Law 1021 authorizing Badlands National Monument. Formal proclamation by President Franklin Roosevelt followed on January 25, 1939. The monument was redesignated Badlands National Park in 1978.
The park's South Unit, known as the Stronghold District, was added in 1976 under a joint operating agreement with the Oglala Sioux Tribe — making it one of the earliest formal National Park co-management arrangements with a sovereign tribal nation. The Stronghold District includes the area where the Ghost Dance movement of 1890 was practiced in the months preceding the Wounded Knee Massacre, which occurred on the adjacent Pine Ridge Reservation on December 29, 1890. The South Unit Visitor Center, the White River Visitor Center, interprets the area's history with cultural authority from the Oglala Sioux Tribe.
The park comprises approximately 244,000 acres, including 64,000 acres of designated wilderness. Mixed-grass prairie covers the parklands between the badlands formations, supporting one of the most successful black-footed ferret reintroduction populations in the United States and a managed bison herd of approximately 1,000 animals.