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Which Finnish territories did Sweden lose to Russia in the Peace of Uusikaupunki in 1721?
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Under the Peace of Uusikaupunki (also known as the Treaty of Nystad) in 1721, which concluded the Second Northern War, Sweden was forced to cede several territories to Russia.
Regarding Finnish lands specifically, Sweden ceded the southeastern part of Finland, which included the city of Viipuri (Vyborg) and a strip of Karelia. In addition to these Finnish territories, Sweden also ceded its Baltic provinces of Estonia, Livonia, and Ingria to Russia.123