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.
The Gemeinde of Keltern encompasses an area of  within the Enz district, located in Baden-Württemberg and Germany. It is situated where the Black Forest transitions into the Kraichgau to its north; most of the municipality lies in the , whose muschelkalk forms the southern hills, while the buntsandstein beneath Weiler, towards the west of the municipality, delineates the northern edge of the Black Forest.