The Arun River is a trans-boundary river that is part of the Koshi or Sapta Koshi river system in Nepal. It originates in the Tibet Autonomous Region of the People's Republic of China where it is called the Phung Chu or Bum-chu.
Country: Nepal, China
State: Tibet
Source: Gutso
Mouth: Confluence with Sun Koshi and Tamur River to form Sapta Koshi
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