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Where does the Ob River begin?
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Ob River
The Ob and Yenisey river basins and their drainage networks.
The Ob River is formed by the junction of the Biya and Katun rivers in the foothills of the Altai Mountains in the Siberian sector of Russia.1
Both of these contributing rivers also originate in the Altai Mountains: the Biya rises in Lake Teletskoye, while the Katun rises to the south among the glaciers of Mount Belukha.2