The Hahn is a 255.8 m (839 ft)-high basalt knoll in the district of Schwalm-Eder-Kreis, within the town of Edermünde-Holzhausen, in Hesse, Germany.

Like many other basalt outcrops in the West Hesse Depression, it is the neck of an extinct Miocene volcano, the rest has been eroded.

Count Werner IV von Grüningen (1060-1121),[2][3] who founded the Benedictine Monastery of Breitenau near Guxhagen in 1113,[4] built a tower castle around 1100 on the Hahn.

[5] It probably consisted of a tower castle on top of the hill, with further fortification on the lower plateau.

It featured rock bands such as the 'Rodgau Monotones', Opus, Wolfgang Ambros and Klaus Lage.