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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.
- Gôppert, H.; Ihringer, J.; Plate, E. J.; Morgenschweis, G. (April 1998). "Flood forecast model for improved reservoir management in the Lenne River catchment, Germany". Hydrological Sciences—Journal—des Sciences Hydrologiques. Pub. 43 (2): 215. doi:10.1080/02626669809492119. CiteSeerX: 10
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