Aldansky District (Russian: Алда́нский улу́с; Sakha: Алдан улууһа) is an administrative and municipal district (raion, or ulus), one of the thirty-four in the Sakha Republic, Russia. It is located in the south of the republic on the right bank of the Lena River near the mouth of the Aldan River and borders with Khangalassky and Amginsky Districts in the north, Ust-Maysky District in the northeast, Khabarovsk Krai in the east, Neryungrinsky District in the south, and with Olyokminsky District in the west and southwest. The area of the district is 156,800 square kilometers (60,500 sq mi). Its administrative center is the town of Aldan. Population: 42,632 (2010 Census); 49,346 (2002 Census); 6,097 (1989 Census).