The New Student's Reference Work/Irtish

Irtish (ĭr′tĭsh), a river of Siberia, the chief branch of the Obi. It rises at the east end of the Altai Mountains, flows toward the northwest for a total distance of 1,620 miles and joins the Obi at Samarow. From April to November it is navigable to Lake Saison.

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