Wiedau
Wiedau is a river of Lower Saxony, Germany. It is a left-hand tributary of the Wümme.
The Wiedau begins near Bellen in the vicinity of Hemslingen in the district of at the confluence of the Hahnenbach and the Mehlandsbach. In the area the Samtgemeinde Bothel, it flows through a densely wooded and near natural depression. It discharges into the Wümme in Rotenburg shortly after being joined by the only slightly smaller Rodau.