Tiksi is an urban locality and the administrative center of Bulunsky District in the Sakha Republic, Russia, located on the shore of the Buor-Khaya Gulf of the Laptev Sea, southeast of the delta of the Lena River. As of the 2010 Census, its population was 5,063.

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.