Tattinsky District is an administrative and municipal district, one of the thirty-four in the Sakha Republic, Russia. It is located in the eastern central part of the republic and borders with Tomponsky District in the north and east, Ust-Maysky District in the south, Churapchinsky District in the southwest, and with Ust-Aldansky District in the northwest. The area of the district is 19,000 square kilometers (7,300 sq mi). Its administrative center is the rural locality of Ytyk-Kyuyol. Population: 17,242 (2010 Russian census); 16,601 ; 15,933 (1989 Soviet census). The population of Ytyk-Kyuyol accounts for 39.6% of the district's total population.

Tomponsky District is an administrative and municipal district, one of the thirty-four in the Sakha Republic, Russia. It is located in the east of the republic and borders with Momsky District in the northeast, Oymyakonsky District in the east, Ust-Maysky District in the southeast, Tattinsky District in the southwest, Ust-Aldansky and Kobyaysky Districts in the west, and with Verkhoyansky District in the north and northwest. The area of the district is 135,800 square kilometers (52,400 sq mi). Its administrative center is the urban locality of Khandyga. Population: 14,099 (2010 Russian census); 15,275 ; 22,844 (1989 Soviet census). The population of Khandyga accounts for 47.1% of the district's total population.