Kirensk is a town and the administrative center of Kirensky District in Irkutsk Oblast, Russia, located at the confluence of the Kirenga and L…Kirensk is a town and the administrative center of Kirensky District in Irkutsk Oblast, Russia, located at the confluence of the Kirenga and Lena Rivers, 950 kilometers north of Irkutsk, the administrative center of the oblast. Population: 12,640 ; 13,712 ; 16,137.