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The Lenne in Iserlohn-Letmathe.
819 m (2,687 ft)
|Basin size||1,353 km2 (522 sq mi)|
|Length||128 km (80 mi)|
Having its source on top of the Kahler Asten near Winterberg in an intermittent spring at an elevation of 2,687 feet, the Lenne ends after a course of 128 km flowing into the Ruhr river near the city of Hagen. With an average discharge of 25 m³/s near its mouth, it is the main tributary of the Ruhr.
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