Irkutsk Oblast (Russian: Ирку́тская о́бласть, Irkutskaya oblast) is a federal subject of Russia (an oblast), located in southeastern Siberia in the basins of the Angara, Lena, and Nizhnyaya Tunguska Rivers. The administrative center is the city of Irkutsk. It had a population of 2,428,750 at the 2010 Census.
Wikipedia ->