description Onon River Overview
The Onon River originates in the Khentii Mountains of northeastern Mongolia and flows through a remote, rugged landscape. It is historically significant as the birthplace region of Genghis Khan, who was born along its upper banks around 1162 CE. The river is a principal headwater of the Amur River, eventually joining the Ingoda and Shilka rivers across the border in Russia. It sustains local ecosystems and remains a culturally important geographic feature in Mongolian history.
help Onon River FAQ
Where does the Onon River begin, and which country does it flow through?
The Onon rises in the eastern Khentii Mountains of Mongolia and then continues north into Russia. It joins the Ingoda River to form the Shilka, part of the Amur drainage system.
Why is the Onon River linked with Genghis Khan?
The upper Onon valley is one of the locations associated with Temüjin's birth and early life, traditionally dated around 1162 CE. The Secret History of the Mongols also places important early events on the Onon.
What are the main tributaries of the Onon River?
Named tributaries include Khurkhyn Gol, Borzya and Unda on the right bank, plus Agutsa, Kyra and Aga on the left. These tributaries run through the transboundary Khentii and Transbaikalia region.
Is the Onon River connected to the Amur River?
Yes. The Onon joins the Ingoda to form the Shilka, and the Shilka later joins the Argun before becoming the Amur River.
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