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The Karelian Isthmus (; ; ) is the approximately 45–110 km wide stretch of land that connects Russia to Finland, situated between the Gulf of Finland and Lake Ladoga in northwestern Russia, to the north of the River Neva (between 61°21’N, 59°46’N and 27°42’E, 31°08’E). Its natural northwestern boundary is either the Salpausselkä ridge in Finland or the relatively narrow area between the Bay of Vyborg and Lake Ladoga. If the Karelian Isthmus is defined as the entire territory of present-day Saint Petersburg and Leningrad Oblast to the north of the Neva, the isthmus' area covers about 15,000 km2. Read full entry

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