The Treaty of Nystad, or the Treaty of Uusikaupunki, was the last peace treaty of the Great Northern War of 1700–1721. It was concluded between the Tsardom of Russia and the Swedish Empire on 10 September 1721 in the then Swedish town of Nystad (Uusikaupunki, in the south-west of present-day Finland).
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The 306th anniversary falls on August 30, 2027.