Abyysky District (Russian: Абы́йский улу́с; Sakha: Абый 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 north of the republic centered on the Indigirka River and borders with Allaikhovsky District in the north, Srednekolymsky District in the east, Verkhnekolymsky District in the southeast, Momsky District in the south, and with Ust-Yansky District in the west. The area of the district is 69,400 square kilometers (26,800 sq mi). Its administrative center is the urban locality (a settlement) of Belaya Gora. Population: 4,425 (2010 Census); 4,750 (2002 Census); 6,097 (1989 Census).