The Ural Mountains separate the Ob-Irtysh river basin and the Volga drainage basin. The rivers Tagil, Tura, Tobol and others, flow down from the eastern slopes, tend to the Ob and Irtysh. Belaya, Kama, Chusovaya tend to the west, towards the Volga and its tributaries.
Dividing lines can pass not only mountains, but hilly areas, small hills.
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