The Bolshoy Anyuy River or Bolshoy Anyui River (Russian: Большой Анюй; bolshoy meaning "great" or "large") is a river in the Kolyma River basin in Far East Siberia. It flows roughly westwards and passes through the sparsely populated areas of Chukotka. The Malyi Anyui River joins it from the north near the Sakha Republic border and the combined river (now called the Anyuy River) properly flows about 20 kilometres (12 mi) to meet the Kolyma at Nizhnekolymsk.