 Its constituent communities of Ahrdt and Mudersbach are on the shores of the Aartalsee (lake).Hohenahr borders in the north on the community of Bischoffen (Lahn-Dill-Kreis), in the east on the community of Biebertal (Gießen district), in the south on the town of Wetzlar, in the southwest on the town of Aßlar, and in the west on the community of Mittenaar (all in the Lahn-Dill-Kreis).The centres of Ahrdt, Altenkirchen, Erda (administrative seat), Großaltenstädten, Hohensolms and Mudersbach are all part of the community.