Irtysh River watershed
|Basin countries||Russia, Kazakhstan, China, Mongolia|
|Length||4,248 kilometres (2,640 mi)|
|Avg. discharge||2,150 cubic metres per second (76,000 cu ft/s) (near Tobolsk)|
|Basin area||1,643,000 square kilometres (634,000 sq mi)|
The Irtysh River (Russian: Иртыш; Kazakh: Ertis / Ертiс; Chinese: 额尔齐斯河 / É'ěrqísī hé; Mongolian: Эрчис мөрөн, "Twirl"; Tatar Cyrillic: Иртеш, Latin: İrteş) is a river in Siberia and Kazakhstan. It is the main tributary of the Ob River. The main tributary of the Irtysh is the Tobol River. The Ob-Irtysh forms a major drainage basin in Asia, and covers most of Western Siberia and the Altay Mountains.