Lake Širvėna

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Lake Širvėna
Location	Biržai
Coordinates	56°12′43″N 24°45′18″E / 56.21194, 24.755Coordinates: 56°12′43″N 24°45′18″E / 56.21194, 24.755
Lake 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.