Nelidovsky District is an administrative and municipal district (raion), one of the thirty-six in Tver Oblast, Russia. It is located in the southwest of the oblast and borders with Andreapolsky District in the north, Selizharovsky District in the northeast, Oleninsky District in the east, Belsky District in the south, Zharkovsky District in the southwest, and with Zapadnodvinsky District in the west. The area of the district is 2,632 square kilometers (1,016 sq mi). Its administrative center is the town of Nelidovo. Population: 30,731 ; 9,144 (2002 Census); 11,829 (1989 Soviet census). The population of Nelidovo accounts for 74.5% of the district's total population.

Andreapolsky District is an administrative and municipal district (raion), one of the thirty-six in Tver Oblast, Russia. It is located in the Valdai Hills in the west of the oblast and borders with Maryovsky District of Novgorod Oblast in the north, Penovsky District in the northeast, Selizharovsky District in the east, Nelidovsky District in the south, Zapadnodvinsky District in the southwest, Toropetsky District in the west, and with Kholmsky District of Novgorod Oblast in the northwest. The area of the district is 3,051 square kilometers (1,178 sq mi). Its administrative center is the town of Andreapol. Population: 13,756 ; 16,213 (2002 Census); 17,900 (1989 Soviet census). The population of Andreapol accounts for 60.2% of the district's total population.