Lake Širvėna

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Lake Širvėna
Sirvenos ezeras.jpg
Širvena lake as seen forn Northwestern corner of Biržai Castle
Location Biržai
Coordinates 56°12′43″N 24°45′18″E / 56.21194°N 24.75500°E / 56.21194; 24.75500Coordinates: 56°12′43″N 24°45′18″E / 56.21194°N 24.75500°E / 56.21194; 24.75500
Type reservoir
Primary inflows Agluona, Apaščia
Basin countries Lithuania
Settlements Biržai, Astravas, Rinkuškiai

Širvėna Lake is a lake located in Biržai municipality, northern Lithuania. It is the oldest artificial lake in Lithuania. It was created in 1575 when the dam was built on rivers Agluona and Apaščia. The lake was built to protect the Radvila castle in Biržai. Now the city of Biržai, which was built around the castle, is located on the southern shore of Širvėna lake. The suburb of Astravas is built on the northern and the suburb of Rinkuškiai on the western shore.