Ust-Aldansky District

Ust-Aldansky District (; ) is an administrative and municipal district (raion, or ulus), one of the thirty-four in the Sakha Republic, Russia. It is located in the center of the republic and borders with Kobyaysky District in the north, Tomponsky District in the northeast, Tattinsky District in the east, Churapchinsky District in the southeast, Megino-Kangalassky District in the south, and with Namsky District in the west. The area of the district is . Its administrative center is the rural locality (a selo) of Borogontsy. Population: 22,372 (2002 Census); The population of Borogontsy accounts for 23.6% of the district's total population.