The Möhne River is a tributary of the Ruhr River in western Germany. It flows through the state of North Rhine-Westphalia and is approximately 90 kilometers long. The river is known for its scenic landscapes and is a popular spot for outdoor activities such as hiking and cycling. The Möhne Reservoir, created by damming the river, is a significant feature of the area. This reservoir not only provides water supply and flood control but also serves as a recreational area for fishing and boating. The river and its surroundings are important for local biodiversity and tourism.