Irkutsk (Russian: Ирку́тск; Buryat: Эрхүү; Mongolian: Эрхүү, Erkhüü) is one of the largest cities in Siberia an the administrative center of Irkutsk Oblast, situated 5,185 kilometers (3,222 mi) by rail from Moscow. Population: 593,604 (2002 Census); 622,301 (1989 Census).