The West Siberian broadleaf and mixed forests, also known as the Western Siberian hemiboreal forests, is an ecoregion in Russia. It consists of a thin band of mixed forest along the southernmost edge of the West Siberian taiga in Western Siberia, and north of the forest steppe belt. The biodiversity of the zone is the highest in Siberia, due to its transitional position between many different ecoregions. The area acts as a long corridor for migration of animals along the east-west axis. The ecoregion is in the Palearctic realm, with a Humid Continental climate. It covers 223,516 km2 (86,300 sq mi).