Beryozovye Islands (Russian: Берёзовые острова, Finnish: Koivisto, Swedish: Björkö; literally: "Birch Islands"), alternatively spelled Berezovye Islands, is an island group in Leningrad Oblast, Russia. The islands are situated at the bottom of the Gulf of Finland, just outside the town of Primorsk on the Karelian Isthmus.
There are 15 islands in the group, the largest is Bolshoy Beryozovy (Large Berezovy, Finnish: Koivistonsaari). Other islands include Zapadny Beryozovy (West Beryozovy, Finnish: Tiurinsaari) and Severny Beryozovy (North Beryozovy, Finnish: Piisaari). The total area of the group, stretching along the coast for 200 km, is 92 km². They are protected by the state as a seabird sanctuary and one of the Ramsar sites in Russia.
Before the third Swedish crusade, the islands paid tax to Novgorod whereupon they became Swedish. In 1721 they became part of Russia, and in 1812 they were restored to the Grand Duchy of Finland with the county of Vyborg. In the independent Finland they belonged to a commune then called Koivisto (Swedish: Björkö). The main settlement on the islands was then called Saarenpää (Krasnoostrovskiy). After WWII, they were ceded by Finland to the Soviet Union. The whole historical Finnish population was expelled and substituted by soviet origin population September 1944 onwards. Place names were russified after 1947 same time with rest of 1944 occupied old Finnish Karelian istmush.
The islands gave name to the Treaty of Björkö (1905).
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