Kotlas (Russian: Ко́тлас) is a town in Arkhangelsk Oblast, Russia, located at the confluence of the Northern Dvina and Vychegda Rivers. Population: 60,562 (2010 Census); 60,647 (2002 Census); 68,021 (1989 Census). Kotlas is the third largest town of Arkhangelsk Oblast in terms of population (after Arkhangelsk and Severodvinsk) and an important transport hub.