Niedenstein's main settlement lies to the southeast of the Habichtswald Nature Park, right on the western slope of the Langenberge, a low mountain range reaching 557 m. The nearest city is Kassel, about 15 km to the northeast.
Niedenstein's main community is located to the southeast of the Habichtswald Nature Park, situated on the western flank of the Langenberge hills, with a maximum height of 557 m. The nearest urban center is Kassel, about 15 km northeast of it.