 Kürnbach is located in the northwestern Stromberg-Heuchelberg Nature Park near Zabergäu in the valley Humsterbaches.The Humsterbach was dammed as a retention basin east of the village next to Schlosswiesensee.To the west, the landscape opens up to the typical cultivated hill country of Kraichgau, while to the east a large contiguous forest area of Stromberg-Heuchelberg nature park begins.