Firovsky District in the context of Administrative divisions of Tver Oblast

Kuvshinovsky District (Russian: Кувши́новский райо́н) is an administrative and municipal district (raion), one of the thirty-six in Tver Oblast, Russia. It is located in the center of the oblast and borders with Vyshnevolotsky District in the north, Torzhoksky District in the east, Staritsky District in the south, Selizharovsky District in the southwest, Ostashkovsky District in the west, and with Firovsky District in the northwest. The area of the district is 1,874 square kilometers (724 sq mi). Its administrative center is the town of Kuvshinovo. Population: 15,386 (2010 Census); 17,847 (2002 census); 20,601 (1989 Soviet census). The population of Kuvshinovo accounts for 65.0% of the district's total population.

Seliger (Russian: Селиге́р, IPA: [sʲɪlʲɪˈgʲer]) is a lake in Ostashkovsky District of Tver Oblast and (in the extreme northern part) in Demyansky District of Novgorod Oblast of Russia, in the northwest of the Valdai Hills, a part of the Volga basin. It has an absolute height of 205 metres (673 ft), an area of 212 square kilometres (82 sq mi), and an average depth of 5.8 metres (19 ft).

Lake Seliger is a large system of bodies of water linked by channels, has many small islands, and is surrounded by forests - including pine woods with many berries and mushrooms. It is one of the biggest natural lakes of Central Russia. The only outflow of the lake, the Selizharovka River, flows from the southern end of the lake and drains into the Volga after 36 kilometres (22 mi). The drainage basin of the lake includes the major part of Ostashkovsky District, the south of Demyansky District, as well as minor areas in the Firovsky District of Tver Oblast.

Ostashkovsky District (Russian: Оста́шковский райо́н) is an administrative and municipal district (raion), one of the thirty-six in Tver Oblast, Russia. It is located in the northwest of the oblast and borders with Demyansky District of Novgorod Oblast in the north, Firovsky District in the northwest, Kuvshinovsky District in the east, Selizharovsky District in the south, Penovsky District in the southwest, and with Maryovsky District of Novgorod Oblast in the west. The area of the district is 3,200 square kilometers (1,200 sq mi). Its administrative center is the town of Ostashkov. Population: 23,761 (2010 Census); 7,357 (2002 census); 8,921 (1989 Soviet census). The population of Ostashkov accounts for 76.1% of the district's total population.

Valdaysky District (Russian: Валда́йский райо́н) is an administrative and municipal district (raion), one of the twenty-one in Novgorod Oblast, Russia. It is located in the southeast of the oblast and borders with Okulovsky District in the north, Bologovsky District of Tver Oblast in the east, the territory of the closed administrative-territorial formation of Ozyorny of Tver Oblast in the southeast, Firovsky District of Tver Oblast in the south, Demyansky District in the southwest, and with Krestetsky District in the northwest. The area of the district is 2,701.63 square kilometers (1,043.11 sq mi). Its administrative center is the town of Valday. Population: 26,476 (2010 census); 29,943 (2002 Census); 32,373 (1989 Soviet census). The population of Valday accounts for 60.8% of the district's total population.

Vyshnevolotsky District (Russian: Вышневоло́цкий райо́н) is an administrative and municipal district (raion), one of the thirty-six in Tver Oblast, Russia. It is located in the north of the oblast and borders with Udomelsky District in the north, Maksatikhinsky District in the northeast, Spirovsky District in the east, Torzhoksky District in the south, Kuvshinovsky District in the southwest, Firovsky District in the west, and with Bologovsky District in the northwest. The area of the district is 3,400 square kilometers (1,300 sq mi). Its administrative center is the town of Vyshny Volochyok (which is not administratively a part of the district). Population: 25,421 (2010 Census); 28,918 (2002 census); 34,579 (1989 Soviet census).