The Wustrow Dumme is a roughly 26 km long, left, western tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the River Jeetzel

Jeetzel

The river Jeetzel, which begins in the Altmark under the name Jeetze, flows from Saxony-Anhalt through Lower Saxony, in Germany. From its source near the village of Dönitz, it flows north through Beetzendorf, Salzwedel, Wustrow, Lüchow and Dannenberg, before joining the Elbe in Hitzacker...

 (also: Jeetze) in Saxony-Anhalt

Saxony-Anhalt

Saxony-Anhalt is a landlocked state of Germany. Its capital is Magdeburg and it is surrounded by the German states of Lower Saxony, Brandenburg, Saxony, and Thuringia.Saxony-Anhalt covers an area of...

 and 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...

 (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...

).

Name

The river name, Dumme, means something like Eichenbach or "oak stream", because Dumme goes back to the Old Slavic

Slavic languages

The Slavic languages , a group of closely related languages of the Slavic peoples and a subgroup of Indo-European languages, have speakers in most of Eastern Europe, in much of the Balkans, in parts of Central Europe, and in the northern part of Asia.-Branches:Scholars traditionally divide Slavic...

 word, dabu, meaning "oak". It is thus unrelated to the German word "dumm", which means "dumb".

Course

The Dumme runs through the border region between Altmark

Altmark

The Altmark is a historic region in Germany, comprising the northern third of Saxony-Anhalt. As the initial territory of the Brandenburg margraves, it is sometimes referred to as the "Cradle of Prussia", as by Otto von Bismarck, a native from Schönhausen near Stendal.- Geography :The Altmark is...

 in the south and Wendland

Wendland

Wendland may refer to either of the following regions or people:*Wendland may refer to a region once inhabited by Wends, an old Germanic term for Slavic tribes living in close proximity to the Germanic tribes:...

 in the north; in places it forms the border

Border

Borders define geographic boundaries of political entities or legal jurisdictions, such as governments, sovereign states, federated states and other subnational entities. Some borders—such as a state's internal administrative borders, or inter-state borders within the Schengen Area—are open and...

 river between 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 Saxony-Anhalt

Saxony-Anhalt

Saxony-Anhalt is a landlocked state of Germany. Its capital is Magdeburg and it is surrounded by the German states of Lower Saxony, Brandenburg, Saxony, and Thuringia.Saxony-Anhalt covers an area of...

. During its course it passes Bergen an der Dumme

Bergen an der Dumme

Bergen an der Dumme is a municipality in the district Lüchow-Dannenberg, in Lower Saxony, Germany. The Polabian name of Bergen is Tjörska , probably derived from tjöra Bergen an der Dumme is a municipality in the district Lüchow-Dannenberg, in Lower Saxony, Germany. The Polabian name of Bergen is...

, before discharging into the northward-flowing Jeetzel near Wustrow, hence the first part of the name.