White River Badlands 43i. Keya Paha Tablelands 43j. Moreau Prairie 43k. It is a semiarid rolling plain of shale, siltstone, and sandstone punctuated by occasional buttes and badlands. Native grasslands persist in areas of steep or broken topography, but they have been largely replaced by spring wheat and alfalfa over most of the ecoregion.
Agriculture is limited by erratic precipitation patterns and limited opportunities for irrigation.
Ponderosa pines grow in the drainages in the hilly land east of the Pine Ridge escarpment. Millet and corn grow on the level land, but the sandy soil limits nonirrigated agriculture. Level to rolling, sandy plains. Dissected near streams. Common Soil Series Anselmo, Kadoka, Keith, Manter, Rosebud, Epping, Keota, Ronson, Vetal.