 In 1989, of the were designated a Federally-protected nature reserve.The municipality ("Gemeinde") of Keltern covers an area of in the Enz district, within the state of Baden-Württemberg and Federal Republic of Germany.It is located where the Black Forest transitions into the Kraichgau to its north; most of the municipality lies in the , whose muschelkalk forms the latter's southern hills, while the buntsandstein under Weiler, towards the west of the municipality, forms the northern edge of the Black Forest.