The Siberian Metropolis is a term used to describe two major cities in Siberia, Russia: Omsk and Irkutsk. Omsk is the administrative center of Omsk Oblast and is located on the banks of the Irtysh River. It is the second largest city in Siberia after Novosibirsk. Irkutsk is the administrative center of Irkutsk Oblast and is located on the Angara River. It is one of the oldest cities in Siberia and is known for its cultural heritage.