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