a narrow strip of land between Lake Ladoga and the Gulf of Finland, in the NW Russian Federation.
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British Dictionary definitions for Karelian Isthmus
a strip of land, now in Russia, between the Gulf of Finland and Lake Ladoga: annexed by the former Soviet Union after the Russo-Finnish War (1939–40)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012