Primorsk (Russian: Примо́рск; Finnish: Koivisto; Swedish: Björkö) is a coastal town in Vyborgsky District of Leningrad Oblast, Russia, and the largest Russian port on the Baltic. It is located on the Karelian Isthmus, 137 kilometers (85 mi) west of St. Petersburg, at the northern coast of the Gulf of Finland, near Birch Islands, protected as a sea bird sanctuary. Population: 6,122 (2010 Census preliminary results); 5,332 (2002 Census); 6,637 (1989 Census).