Omsk is a city and the administrative center of Omsk Oblast, Russia, located in southwestern Siberia 2,236 kilometers (1,389 mi) from Moscow. With a population of 1,154,116, it is Russia's third-largest city east of the Ural Mountains after Novosibirsk and Yekaterinburg, and seventh by size nationally. Omsk acts as an essential transport node, serving as a train station for the Trans-Siberian Railway and as a staging post for the Irtysh River.
