Badlands National Park is a protected area in southwestern South Dakota, United States. The park covers over 244,000 acres of eroded rock formations, deep canyons, spires, and other unique geologic features. The rugged terrain of the park supports a variety of wildlife, including bison, pronghorns, bighorn sheep, coyotes, and eagles.

The park's name comes from the Lakota people, who called the area "mako sica" meaning "land bad." The park was established as a national monument in 1929, and was later redesignated as a national park in 1978.

Visitors to Badlands National Park can enjoy scenic drives, hiking trails, and camping opportunities. The park is home to several distinct ecosystems, including mixed-grass prairie, badlands formations, and riparian areas. Popular hiking trails include the Notch Trail, Saddle Pass Trail, and Castle Trail, which is the longest trail in the park at 10 miles.

Badlands National Park also contains several historic sites, such as the Fossil Exhibit Trail, which features interpretive displays about the park's ancient fossils and geologic history. Additionally, visitors can explore the park's numerous rock formations, including the striking Pinnacles, which are tall spires of layered rock that jut out from the surrounding landscape.