Lensk (Russian:Ленск;IPA:[lʲɛnsk]; Yakut:Лиэнскэй, Lienskey) is a town and the administrative center of Lensky District of the Sakha Republic, Russia, located on the left bank of the Lena River, approximately 840 kilometers (520mi) west of Yakutsk, the capital of the republic. As of the 2010 Census, its population was24,966.