Zhigansky District is an administrative and municipal district, one of the thirty-four in the Sakha Republic, Russia. It is located in the northern central part of the republic and borders with Bulunsky District in the north, Eveno-Bytantaysky National District in the east, Kobyaysky District in the southeast, Vilyuysky District in the southwest, and with Olenyoksky District in the northwest. The area of the district is 140,200 square kilometers (54,100 sq mi). Its administrative center is the rural locality of Zhigansk. Population: 4,296 (2010 Russian census); 4,312 ; 5,678 (1989 Soviet census). The population of Zhigansk accounts for 79.6% of the district's total population.

Bulunsky District is an administrative and municipal district, one of the thirty-four in the Sakha Republic, Russia. It is located in the north of the republic and borders Ust-Yansky District in the east, Verkhoyansky District in the southeast, Eveno-Bytantaysky and Zhigansky Districts in the south, Olenyoksky District in the west, and Anabarsky District in the northwest. The area of the district is 223,600 square kilometers (86,300 sq mi). Its administrative center is the urban-type settlement of Tiksi. As of the 2010 Census, the total population of the district was 9,054, with the population of Tiksi accounting for 55.9% of that number.