Cottbuser Ostsee
The Cottbuser Ostsee (Cottbus Eastern Lake; Lower Sorbian: Chóśebuski pódzajtšny jazor) is an artificial lake under development on the grounds of the former open-pit lignite mine de:Tagebau Cottbus Nord near Cottbus, Brandenburg, Germany. When complete, it is to cover a surface area of 19 km2 (7.3 sq mi), making it one of the biggest artificial lakes in the country.[1] Flooding started in 2019[2][3] but had to be interrupted several times due to low water levels in the nearby Spree River.[4][5] The lake is to become part of the Lusatian Lake District, a chain of artificial lakes mostly the result of open-pit lignite mining. The name can be interpreted as a pun on the German name for the Baltic Sea, which is called "Ostsee" in German, the two words only being distinguished by their grammatical gender: "See" meaning "sea" in German is grammatically female, whereas "See" meaning "lake" in German is grammatically male.

References
- "Cottbuser Ostsee | Wie ein neuer See entsteht". www.leag.de.
- "Geburtsstunde für größten See Brandenburgs: Tagebau geflutet". April 12, 2019 – via www.welt.de.
- "» OSTSEE-FLUTUNG IST STARTSCHUSS FÜR COTTBUSER PERSPEKTIVEN".
- "Dem Cottbuser Ostsee geht das Wasser aus - bevor es da ist". www.rbb24.de.
- "Umweltminister stuft Lage in Gewässern als "super-ernst" ein". www.rbb24.de.