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The Volga Region is almost entirely within the East European Plain, with a notable distinction contrasting the elevated western side featuring the Volga Upland, and the eastern side known as Transvolga (, Zavolzhye). The latter consists of the elevated High Transvolga and the lowland Low Transvolga. The Idel-Ural region, a collection of six federal subjects between the Volga River and the Ural Mountains, is generally considered as a part of the Volga Region, although the river does not run through each of them. Idel-Ural is within an extensive north-western protrusion of the Volga River's drainage basin, including numerous tributaries such as the Malaya Kokshaga River. It also includes sub-tributaries, such as the Belaya River which joins the Kama River, a tributary of the Volga.