India Geography भारत का भूगोल Which of the following river was initially known as Arun river?

kosa

Koderma is one of the districts of Jharkhand which is blessed with abundant natural resources and rich mineral deposits throughout the district. Earlier it was famous for production of world class mica and was known as the Mica Capital of India or Abrakh-Nagri.

The Arun River is a trans-boundary river and is part of the Kosi or Sapt Koshi river system in Nepal. It originates in Tibet Autonomous Region of the Peoples Republic of China where it is called the Phung Chu or Bum-chu. Wikipedia