Jonkeri

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Jonkeri is a medium-sized lake in Kuhmo, Finland. It lies in the Kainuu region and is part of the Vuoksi main catchment area. The lake is about 4 kilometers from the Finnish–Russian border. Historically, Jonkeri lay on the border between Sweden and Russia. A border stone called Jonkerinkivi sits on the lake, marking the border from the 17th century under the Treaty of Stolbovo.