Priozersky District in the context of "Russian Census (2002)"

The Karelian Isthmus (Russian: Карельский перешеек, romanized: Karelsky peresheyek; Finnish: Karjalankannas; Swedish: Karelska näset) is the approximately 45–110-kilometre-wide (30–70 mi) stretch of land situated between the Gulf of Finland and Lake Ladoga in northwestern Russia, to the north of the River Neva. Its northwestern boundary is a line from the Bay of Vyborg to the westernmost point of Lake Ladoga, Pekonlahti. If the Karelian Isthmus is defined as the entire territory of present-day Saint Petersburg and Leningrad Oblast to the north of the Neva and also a tiny part of the Republic of Karelia, the area of the isthmus is about 15,000 km (5,800 sq mi).

The smaller part of the isthmus to the southeast of the old Russia-Finland border is considered historically as Northern Ingria, rather than part of the Karelian Isthmus itself. The rest of the isthmus was historically a part of Finnish Karelia. This was conquered by the Russian Empire during the Great Northern War in 1712 and included within the autonomous Grand Duchy of Finland (1809–1917) of the Russian Empire. When Finland became independent in 1917, the isthmus (except for the territory roughly corresponding to present-day Vsevolozhsky District and some districts of Saint Petersburg) remained Finnish. Finnish Karelia was partly ceded to the Soviet Union by Finland following the Winter War (1939–1940) and Continuation War (1941–1944). In 1940–1941, during the Interim Peace, most of the ceded territories in the isthmus were included within the Karelo-Finnish SSR. However, since World War II the entire isthmus has been divided between the city of Saint Petersburg (mostly Kurortny District), as well as Priozersky District, Vsevolozhsky District and Vyborgsky District of Leningrad Oblast.

Vsevolozhsky District (Russian: Все́воложский райо́н) is an administrative and municipal district (raion), one of the seventeen in Leningrad Oblast, Russia. It is located in the central northwestern part of the oblast on the Karelian Isthmus and borders with Priozersky District in the north, Kirovsky District in the south, Vyborgsky District in the northwest, Nevsky, Krasnogvardeysky, Kalininsky, Vyborgsky, and Kurortny Districts of the federal city of St. Petersburg in the west, and is washed by Lake Ladoga in the east. The area of the district is 3,036.4 square kilometers (1,172.4 sq mi). Its administrative center is the town of Vsevolozhsk. Population (excluding the administrative center): 153,045 (2010 census); 131,233 (2002 Census); 135,318 (1989 Soviet census).

Vyborgsky District (Russian: Вы́боргский райо́н, romanized: Výborgskiy raión, IPA: [ˈvɨbərkskʲɪj rɐˈjɵn]) is an administrative and municipal district (raion), one of the seventeen in Leningrad Oblast, Russia. It is located in the northwest of the oblast on the Karelian Isthmus and borders with Priozersky District in the northeast, Vsevolozhsky District in the east, Kurortny District of the federal city of St. Petersburg in the south, Kymenlaakso and South Karelia regions of Finland in the northwest, and Lakhdenpokhsky District of the Republic of Karelia in the north. From the southwest, the district is limited by the Gulf of Finland. The area of the district is 7,475.472 square kilometers (2,886.296 sq mi). Its administrative center is the town of Vyborg. Population (excluding the administrative center): 120,446 (2010 census); 113,748 (2002 Census); 108,571 (1989 Soviet census).