Irtish
From BiblePortal Wikipedia
Irtish [1]
An enormous river of Western Siberia and chief tributary of the Obi; its course from the Altai Mountains runs NW. through the Siberian plains for 1200 m.; it is navigable almost all the way in summer, and in winter it is a highway for sledge traffic; on its banks stand Semipalatinsk, Omsk, and Tobolsk.
