It rises in the Altai Mountains in western Mongolia, flows south into China's Xinjiang (Altay Prefecture), where it turns north-west to empty into the Ulungur Lake.
[1] The Sino-Mongolian beaver, Castor fiber birulai, is found only in the basin of the Ulungur River.
The Bulgan Beaver Nature Reserve (Chinese: 布尔根河河狸自然保护区; 46°12′00″N 90°45′00″E / 46.20000°N 90.75000°E / 46.20000; 90.75000) has been established on the Bulgan River (a tributary of the Ulungur River) in Qinggil (Qinghe) County in 1980 to protect the creatures.
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