How much of the Ob River basin lies on the West Siberian Plain?

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Ob River The Ob and Yenisey river basins and their drainage networks.

Approximately 85 percent of the Ob basin lies on the West Siberian Plain. The remainder of the basin consists of the terraced plains of Turgay in Kazakhstan, as well as various mountainous regions and ridges in the southeast, including the Altai Mountains, the Salair Ridge, and the Kuznetsk Alatau range.1