|This article does not cite any references or sources. (December 2009)|
|Onon River (Онон гол)|
|Nickname: Queen Mother Onon|
|- location||eastern Khentii Mountains|
|Length||817 km (508 mi)|
|Basin||94,010 km2 (36,297 sq mi)|
The Onon (Mongolian: Онон гол, Russian: Оно́н) is a river in Mongolia and Russia of length 818 km and watershed 94,010 km². It originates at the eastern slope of the Khentii Mountains. For 298 km it flows within Mongolia. Its confluence with Ingoda River produces Shilka River.
The flow Onon—Shilka—Amur produces one of the world's ten longest rivers (818 km + 560 km + 2,874 km).
The upper Onon is one of the areas that are claimed to be the place where Genghis Khan was born and grew up.
The Secret History of the Mongols begins thus: “There came into the world a "Borte Chono" (blue-gray wolf) whose destiny was Heaven’s will. His wife was a "Gua Maral" (beauty fallow doe). They traveled across the inland sea and when they were camped near the source of the Onon River in sight of Burkhan Khaldun and their first son was born, named Bat Tsagaan.”