Ohm (river)
 The Ohm the right tributary of the Lahn is a river in Hesse Germany Its total length is 59 km. The Ohm originates in the Vogelsberg Mountains east of the town Ulrichstein. It flows generally northwest through Ulrichstein Mücke Homberg (Ohm) Amöneburg and Kirchhain. The Ohm joins the Lahn in Cölbe near Marburg.