From the Wikipedia page 
Vyborgsky District (Russian: Вы́боргский райо́н) 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.