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Diemel bei Trendelburg.jpg
The Diemel near Trendelburg
Country Germany
Physical characteristics
Main source Sauerland
680 m (2,230 ft)
51°15′59″N 8°39′05″E / 51.26639°N 8.65139°E / 51.26639; 8.65139
River mouth Weser
51°38′33″N 9°26′52″E / 51.64250°N 9.44778°E / 51.64250; 9.44778Coordinates: 51°38′33″N 9°26′52″E / 51.64250°N 9.44778°E / 51.64250; 9.44778
Length 110.4 km (68.6 mi) [1]
Basin features
Progression WeserNorth Sea
Basin size 1,762 km2 (680 sq mi) [1]

The Diemel is a river in Hesse and North Rhine-Westphalia, Germany. It is a left tributary of the Weser.


The source of the Diemel is near Willingen, in Sauerland. The Diemel flows generally northeast through the towns Marsberg, Warburg, and Trendelburg. It flows into the Weser in Bad Karlshafen.