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The Ob-Irtysh River or Ob River is a river in the Western Siberian region of northern Asia and is the seventh longest river in the world. It is considered the third great Siberian river flowing in the Arctic Sea with the Yenisey River and the Lena River. Ob's Gulf is considered to be the world's longest estuary. The beginning of the OB river is 26 km south-west of the city of Biysk in Altai Krai, Russia and from the confluence of the Biya river and the Katun river. The length of this river is 5410 km (3364 miles).

Map Of The Ob-Irtysh River