One of the finest Oligocene fossil beds of mammals in the world lies beneath the Badlands. Located between the Cheyenne and White rivers in southwestern South Dakota, the area also contains spectacular examples of weathering and erosion. Irregular ravines, fantastic ridges, low hills and cliffs display variegated color alternating with grayish white sediment.

All areas are open for hiking. Ranger-guided tours include nature walks, fossil talks and evening amphitheater presentations. Picnicking is permitted throughout the park but campfires are not allowed.