The Wümme is a river

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 northern Germany

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...

. It is the left tributary of the Lesum

Lesum

The Lesum is a 10 km long river in northern Germany, right tributary of the Weser. It is formed at the confluence of the rivers Wümme and Hamme, near Ritterhude, northwest of Bremen. It flows west and flows into the Weser in Bremen-Vegesack....

, which runs into the river Weser.

It runs 118 km across northern Lower Saxony

Lower Saxony

Lower Saxony is a German state situated in north-western Germany and is second in area and fourth in population among the sixteen states of Germany...

 and the state of Bremen

Bremen (state)

The Free Hanseatic City of Bremen is the smallest of Germany's 16 states. A more informal name, but used in some official contexts, is Land Bremen .-Geography:...

, marking the border between the two states for part of its course.

The river's source is located on the Wulfsberg in Lüneburg Heath

Lüneburg Heath

The Lüneburg Heath is a large area of heath, geest and woodland in northeastern part of the state of Lower Saxony in northern Germany. It forms part of the hinterland for the cities of Hamburg, Hanover, and Bremen and is named after the town of Lüneburg. Most of the area is a nature reserve...

. West of Rotenburg

Rotenburg an der Wümme

Rotenburg an der Wümme is a town in Lower Saxony, Germany. It is the capital of the district of Rotenburg.-Geography:...

, it takes up the rivers Rodau and Wiedau

Wiedau

The Wiedau is a left-hand tributary of the Wümme in the north German state of Lower Saxony. The river begins near Bellen in the vicinity of Hemslingen in the district of Rotenburg at the confluence of the Hahnenbach and the Mehlandsbach, flows through the collective municipality of Bothel, a...

. It merges with the Hamme

Hamme River

The Hamme is a 48 km long river in Germany, Lower Saxony, north-east of Bremen. Its source is north of Osterholz-Scharmbeck. It flows through the moors north-east of Bremen called Teufelsmoor , and meets the river Wümme in Ritterhude. From this junction, the river is called Lesum...

 by Wasserhorst where the two rivers combine to form the Lesum.

Towns on the river Wümme:

• Lauenbrück
  Lauenbrück
  Lauenbrück is a municipality in the district of Rotenburg, in Lower Saxony, Germany.Lauenbrück belonged to the Prince-Bishopric of Verden, established in 1180...
  
  
• Scheeßel
  Scheeßel
  Scheeßel is a municipality in the district of Rotenburg, in Lower Saxony, Germany. It is situated on the river Wümme, approx. 10 km northeast of Rotenburg, 45 km east of Bremen, and 70 km southwest of Hamburg....
  
  
• Rotenburg
  Rotenburg an der Wümme
  Rotenburg an der Wümme is a town in Lower Saxony, Germany. It is the capital of the district of Rotenburg.-Geography:...
  
  
• Ottersberg
  Ottersberg
  Ottersberg is a municipality in the district of Verden, in Lower Saxony, Germany. It is situated approx. 20 km north of Verden, and 28 km east of Bremen.-History:Ottersberg belonged to the Prince-Archbishopric of Bremen, established in 1180...
  
  
• Fischerhude
• Lilienthal
  Lilienthal, Lower Saxony
  The municipality of Lilienthal belongs to the administrative district of Osterholz, Lower Saxony and borders Bremen.-History:Lilienthal belonged to the Prince-Archbishopric of Bremen. The history of the city of Lilienthal goes back to its founding as a monastery by the prince-archbishop Gerhard II...
  
  
• Bremen