Gemünden lies roughly 22 km northeast of Marburg on the edge of the Burgwald range to the west and near the Kellerwald range rising to the northeast.
Gemünden borders in the north on the community of Haina (Waldeck-Frankenberg), in the east on the community of Gilserberg (Schwalm-Eder-Kreis), in the south on the community of Wohratal (Marburg-Biedenkopf) and in the west on the town of Rosenthal (Waldeck-Frankenberg).