Irtysh River
 The Irtysh River (Russian: Иртыш; Kazakh: Ертiс / Yertis; Chinese: 额尔齐斯河 pinyin: É'ěrqísī hé; Uyghur: ئېرتىش; Mongolian: Эрчис мөрөн/Erchis erchleh twirl; Tatar Cyrillic: Иртеш Latin: İrteş) is a river in Siberia and Kazakhstan and is the chief tributary of the Ob River.Irtysh's main affluents are the Tobol River and the Ishim River. The Ob-Irtysh system forms a major drainage basin in Asia encompassing most of Western Siberia and the Altai Mountains.