Kalyazinsky District is an administrative and municipal district (
raion), one of the
thirty-six in
Tver Oblast,
Russia. It is located in the southeast of the
oblast and borders with
Uglichsky District of
Yaroslavl Oblast in the northeast,
Pereslavsky District of Yaroslavl Oblast in the southeast,
Sergiyevo-Posadsky District of
Moscow Oblast in the south,
Taldomsky District, also of Moscow Oblast, in the southwest,
Kimrsky District in the west, and with
Kashinsky District in the northwest. The area of the district is . Its
administrative center is the
town of
Kalyazin. Population: 21,688 (
2010 Census); The population of Kalyazin accounts for 63.9% of the district's total population.