How long did Russia occupy Finland during the Great Northern War?

During the Great Northern War, Russia occupied Finland for eight years, from 1713 to 1721. This period of hostile occupation weakened Sweden's ability to defend the region and left the Finnish population with a lasting sense of insecurity. The occupation concluded with the Peace of Uusikaupunki (Nystad) in 1721, which forced Sweden to cede the Baltic provinces and the southeastern part of Finland, including Viipuri, to Russia.12