Shlisselburg is a town in Leningrad Oblast, Russia, situated at the head of the Neva River on Lake Ladoga, 35 km east of St. Petersburg. From 1944-1992 it was known as Petrokrepost. The town's population was 12,401 as of the Russian Census of 2002. The fortress and the city center are UNESCO World Heritage Sites. The fortress Built originally as a wooden fortress named Oreshek (also Orekhov) ("Nutlet") by Grand Prince Yury of Moscow (in his capacity as Prince of Novgorod) on behalf of the Nov… (More on Oreshek)