Shlisselburg (Russian: Шлиссельбург; IPA: [ʂlʲɪsʲɪlʲˈburk]; German: Schlüsselburg; Swedish: Nöteborg) is a town in Kirovsky District of Leningrad Oblast, Russia, located at the head of the Neva River on Lake Ladoga, 35 kilometers (22 mi) east of St. Petersburg. From 1944 to 1992, it was known as Petrokrepost (Петрокрепость). Population: 13,170 (2010 Census); 12,401 (2002 Census); 12,589 (1989 Census).The fortress and the town center are UNESCO World Heritage Sites.