Western Siberia or West Siberia (Russian: Западная Сибирь, translit. Zapadnaja Sibir') is a part of the greater Siberia. It lays between the region of Ural and the Yenisei River which conditionally divides Siberia into two halves.
The area of Western Siberia is 2.5 million square kilometres. Nearly 80% of the Western Siberia's area is located within the West Siberian Plain. The largest rivers of the region is the Irtysh and the Ob.
The most populous city of Western Siberia is the city of Novosibirsk. Other major cities include: