The
West Siberian Plain, also known as
Zapadno-sibirskaya Ravnina, is a large
plain that occupies the western portion of
Siberia, between the
Ural Mountains in the west and the
Yenisei River in the east, and by the
Altay Mountains on the southeast. Much of the plain is poorly drained and consists of some of the world's largest swamps and floodplains. Important cities include
Omsk,
Novosibirsk and
Chelyabinsk.