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The Lenne in Iserlohn-Letmathe.
|Source elevation||819 m|
|Avg. discharge||25 m³/s|
|Basin area||1,353 km²|
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.
- H. GÔPPERT, J. IHRINGER & E. J. PLATE, and G. MORGENSCHWEIS (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. Retrieved 14 February 2015.
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