Korsakov (Russian: Корсаков; Japanese: 大泊町, Ōdomari-chou / Ōtomari-chou) is a town and the administrative center of Korsakovsky District of Sakhalin Oblast, Russia. It is located 42 kilometers (26 mi) south from Yuzhno-Sakhalinsk, at the southern end of Sakhalin Island, on the coast of the Salmon Cove in the Aniva Bay. The town has a population of 33,526 as of the 2010 census.