Irkutsk ( eer-KOOTSK; Russian: Иркутск, IPA: [ɪrˈkutsk]; Buryat and Mongolian: Эрхүү, Erhüü, [ɛrˈxuː]) is the largest city and administrative center of Irkutsk Oblast, Russia. With a population of 587,891 as of the 2010 Census, Irkutsk is the 25th-largest city in Russia by population, the fifth-largest in the Siberian Federal District, and one of the largest cities in Siberia. https://en.wikipedia.org/wiki/Irkutsk