The Southern Black Forest refers to the highest part of the Black Forest which was heavily transformed by ice age glaciation south of a line roughly from Freiburg im Breisgau to Donaueschingen. The term High Black Forest is not quite identical; that usually includes the highest part of the Central Black Forest, southeast of the Elz valley, as well. The Southern Black Forest Nature Park (Naturpark Südschwarzwald) also takes in this area, extending across the whole of the High Black Forest as well as several peripheral areas.