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|Native name||Орхон гол|
|Aimags||Arkhangai, Övörkhangai, Bulgan, Selenge|
|Major cities||Kharkhorin, Bulgan, Sükhbaatar|
|• location||Tsenkher sum, Arkhangai|
|Sükhbaatar city, Selenge aimag|
|Length||1,124 km (698 mi)|
|Basin size||132,835 km2 (51,288 sq mi)|
|• average||66 m3/s (2,300 cu ft/s)|
|• minimum||0.5 m3/s (18 cu ft/s)February|
|• maximum||190.2 m3/s (6,720 cu ft/s)July|
|Progression||Selenga→ Lake Baikal→ Angara→ Yenisey→ Kara Sea|
|• left||Tamir River|
|• right||Tuul River, Kharaa River|
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 metres (33 ft) wide and twenty metres (66 ft) 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.
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.
H. Barthel, Mongolei-Land zwischen Taiga und Wüste, Gotha 1990, p. 34f
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