Orhon River
| Orkhon River (Орхон гол) | |
| Orkhon Gol | |
| River | |
 |
|
| Country |  Mongolia |
|---|---|
| Aimags | Arkhangai, Övörkhangai, Bulgan, Selenge |
| Major cities | Kharkhorin, Bulgan, Sükhbaatar |
| Tributaries | |
| - left | Tamir River |
| - right | Tuul River, Kharaa River |
| Source | Suvraga Khairkhan |
| - location | Tsenkher sum, Arkhangai |
| - coordinates | 47°2′59″N 101°20′30″E / 47.04972°N 101.34167°E |
| Mouth | Selenge River |
| - location | Sükhbaatar city, Selenge aimag |
| - coordinates | 50°15′0″N 106°8′20″E / 50.25000°N 106.13889°ECoordinates: 50°15′0″N 106°8′20″E / 50.25000°N 106.13889°E |
| Length | 1,124 km (698 mi) |
| Basin | 132,835 km2 (51,288 sq mi) |
| Discharge | for Bulgan |
| - average | 66 m3/s (2,331 cu ft/s) |
| - max | 190.2 m3/s (6,717 cu ft/s) July |
| - min | 0.5 m3/s (18 cu ft/s) February |
The Orkhon River (Mongolian: Орхон гол, Orkhon gol) is a river in Mongolia.
It rises in the Khangai Mountains in the Tsenkher sum of Arkhangai aimag at the foot of the Suvraga Khairkhan mountain. From there it crosses the border into Övörkhangai aimag and follows the upper Orkhon valley in eastern direction until it reaches Kharkhorin. On this stretch, very close to the Orkhon the Ulaan Tsutgalan river features a waterfall, ten meters wide and twenty meters high. The waterfall is a popular destination for tourists.
From Kharkhorin it flows northwards until it reaches Bulgan aimag, and then north-east to join the Selenge River next to Sükhbaatar city in the Selenge aimag, close to the Russian border. The Selenge then flows further north into Russia and Lake Baikal.
With 1,124 km (698 mi), the Orkhon is longer than the Selenge, making it the longest river in Mongolia. Major tributaries of the Orkhon river are the Tuul River and Tamir River.
There are two sets of ancient ruins along the river valley: Khar Balgas, the ancient capital of the Uyghur Kingdom and Karakorum, the ancient capital of the Mongol Empire. Pyotr Kuzmich Kozlov excavated several Xiongnu Imperial tombs in the area of the river valley.
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Wikipedia