Belsky District (Russian: Бе́льский райо́н) 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 Nelidovsky District in the north, Oleninsky District in the northeast, Sychyovsky District of Smolensk Oblast in the east, Novoduginsky District of Smolensk Oblast in the southeast, Kholm-Zhirkovsky District of Smolensk Oblast in the south, Dukhovshchinsky District of Smolensk Oblast in the southwest, and with Zharkovsky District in the west. The area of the district is 2,135 square kilometers (824 sq mi). Its administrative center is the town of Bely. Population: 6,582 (2010 Census); 8,125 (2002 Census); 10,005 (1989 Census). The population of Bely accounts for 57.3% of the district's t