region of south dakota

South Dakota is generally divided into three main geographic regions: eastern South Dakota, western South Dakota, and the Black Hills. The Missouri River acts as a significant boundary separating eastern and western parts of the state. The Black Hills, located in the southwestern corner, are distinct from the rest of western South Dakota due to their mountainous geography. These regions are sometimes grouped into two major areas called East River (east of the Missouri River) and West River (west of the Missouri River). Eastern South Dakota is characterized by lower elevation and higher precipitation, with sub- regions such as the Coteau des Prairies, James River Valley, and the Dissected Till Plains. Western South Dakota is more arid and rugged, including plains, rolling hills, and the Badlands. The Black Hills are a low mountain range with peaks rising significantly above the surrounding landscape and are geologically and culturally distinct.