Shlisselburg, formerly Oreshek (Орешек) (1323–1611) and Petrokrepost (Петрокрепость) (1944–1992), is a town in Kirovsky District, Leningrad Oblast, Russia, located at the head of the Neva River on Lake Ladoga, 35 kilometers (22 mi) east of St. Petersburg. Population: 13,170 (2010 Russian census); 12,401 (2002 Census); 12,589 (1989 Soviet census).

Kirovsky District is an administrative and municipal district (raion), one of the seventeen in Leningrad Oblast, Russia. It is located in the center of the oblast and borders with Volkhovsky District in the east, Kirishsky District in the southeast, Nevsky and Kolpinsky Districts of the federal city of St. Petersburg in the west, Tosnensky District in the southwest, and with Vsevolozhsky District in the northwest. From the north, the district is bounded by Lake Ladoga. The area of the district is 2,590.46 square kilometers (1,000.18 sq mi). Its administrative center is the town of Kirovsk. Population : 62,533 (2010 Russian census); 60,221 ; 74,725 (1989 Soviet census).