Hammergraben is a river of

Brandenburg Brandenburg (; nds, Brannenborg; dsb, Bramborska ) is a states of Germany, state in the northeast of Germany bordering the states of Mecklenburg-Vorpommern, Lower Saxony, Saxony-Anhalt, and Saxony, as well as the country of Poland. With an ar ...

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

. It branches off the

Spree Spree may refer to: Geography * Spree (river), river in Germany Film and television * ''The Spree'', a 1998 American television film directed by Tommy Lee Wallace * ''Spree'' (film), a 2020 American film starring Joe Keery * "Spree" (''Numbers' ...

Cottbus Cottbus (; Lower Sorbian: ''Chóśebuz'' ; Polish: Chociebuż) is a university city and the second-largest city in Brandenburg, Germany. Situated around southeast of Berlin, on the River Spree, Cottbus is also a major railway junction with exten ...

, and flows into the Großes Fließ (a tributary of the Spree) in Schmogrow-Fehrow. It is used to flood Cottbuser Ostsee, a former open pit lignite mine, which is planned to become Germany's largest artificial lake by surface area.

See also