The Diemel is a river
A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in Hesse
Hesse or Hessia is both a cultural region of Germany and the name of an individual German state.* The cultural region of Hesse includes both the State of Hesse and the area known as Rhenish Hesse in the neighbouring Rhineland-Palatinate state...

 and North Rhine-Westphalia
North Rhine-Westphalia
North Rhine-Westphalia is the most populous state of Germany, with four of the country's ten largest cities. The state was formed in 1946 as a merger of the northern Rhineland and Westphalia, both formerly part of Prussia. Its capital is Düsseldorf. The state is currently run by a coalition of the...

, Germany
Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

, left tributary of the Weser. Its source is near Willingen
Willingen is a community in Waldeck-Frankenberg in northern Hesse, Germany, some 80 km west of Kassel.Willingen is regularly advertised as Willingen Hochsauerland and Willingen .-Location:...

, in Sauerland
The Sauerland is a rural, hilly area spreading across most of the south-eastern part of North Rhine-Westphalia, in parts heavily forested and, apart from the major valleys, sparsely inhabited...

. The Diemel flows generally northeast through the towns Marsberg
Marsberg is a town in the Hochsauerland district, in North Rhine-Westphalia, Germany.-History:Although its origins are obscure, Marsberg was a prospering town by the 13th century . It was a free city until 1807, when it was incorporated into the Kingdom of Westphalia, until 1813...

, Warburg
Warburg is a town in eastern North Rhine-Westphalia on the river Diemel near the three-state point shared by Hessen, Lower Saxony and North Rhine-Westphalia. It is in Höxter district and Detmold region...

 and Trendelburg
Trendelburg is a town in the district of Kassel, in Hesse, Germany with a population of 5,282 on 30 September 2009. It is situated on the river Diemel, north of Kassel.The town is twinned with Pocklington, England....

. It flows into the Weser in Bad Karlshafen
Bad Karlshafen
Bad Karlshafen is a baroque, thermal salt spa town in the district of Kassel, in Hesse, Germany. It has 2300 inhabitants in the main ward of Bad Karlshafen, and a further 1900 in the medieval ward of Helmarshausen...

. The total length of the Diemel is 106 km.
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