Wümme (German pronunciationⓘ) is a river in northern Germany, in the states Lower Saxony and Bremen, marking the border between the two states for part of its course.

[5] West of Rotenburg, it takes up the rivers Rodau and Wiedau.

The Wümme from the left and the Hamme from the right combine near Wasserhorst (part of Blockland in Bremen) forming the Lesum.

[2] Towns on the river Wümme are Lauenbrück, Scheeßel, Rotenburg, Ottersberg, Fischerhude, Lilienthal and Bremen.

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