Wikipedia EN Oder (Rhume)
The Oder (German pronunciation: [ˈoːdɐ] ) is a 56-kilometre-long (35 mi) river in Lower Saxony, Germany, and a right tributary of the Rhume. Its source is in the Harz mountains, near Sankt Andreasberg. It flows southwest through Bad Lauterberg, Pöhlde and Hattorf am Harz. The Oder flows into the Rhume in Katlenburg-Lindau.
Source: Wikipedia https://en.wikipedia.org/wiki/Oder_(Harz)