Tosnensky District is an administrative and municipal district (raion), one of the seventeen in Leningrad Oblast, Russia. It is located in the central southwestern part of the oblast and borders with Kirovsky District in the north, Kirishsky District in the east, Chudovsky District of Novgorod Oblast in the southeast, Novgorodsky District of Novgorod Oblast in the south, Luzhsky District in the southwest, Gatchinsky District in the west, and Pushkinsky and Kolpinsky Districts of the federal city of Saint Petersburg in the northwest. The area of the district is 3,585.4 square kilometers (1,384.3 sq mi). Its administrative center is the town of Tosno. Population : 83,898 (2010 Russian census); 77,194 ; 78,500 (1989 Soviet census).

Chudovsky District is an administrative and municipal district (raion), one of the twenty-one in Novgorod Oblast, Russia. It is located in the north of the oblast and borders with Kirishsky District of Leningrad Oblast in the northeast, Malovishersky District in the southeast, Novgorodsky District in the southwest, and with Tosnensky District of Leningrad Oblast in the northwest. The area of the district is 2,370 square kilometers (920 sq mi). Its administrative center is the town of Chudovo. Population: 22,011 (2010 Russian census); 25,829 ; 27,355 (1989 Soviet census). The population of Chudovo accounts for 70.0% of the district's total population.