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Seskar (Finnish: Seiskari) (Russian: Сескар) is an island in the Gulf of Finland, part of the Leningrad Oblast of Russia. The island was an independent municipality of Finland populated by Finns at least since 16th century, until 1940, when ownership was transferred to the Soviet Union following the Moscow Peace Treaty. The ownership was ratified after World War II.
- Risto Hamari, Martti Korhonen, Timo Miettinen, Ilmar Talve: Suomenlahden ulkosaaret; Lavansaari, Seiskari, Suursaari, Tytärsaari, Jyväskylä 1996; ISBN 951-717-879-4 (Finnish)