Nepal has four chief river system with more than two- hundred fifty considerable branch.
The major rivers are:- The Sapta Kosi in the eastern Nepal, the Narayani in the central Nepal, the Karnali in the western Nepal and the Mahakali in the remote western Nepal. Arun River belongs to Koshi river system that flows in the Eastern Nepal. The easiest way to get to the river is fly to Tumlingtar. Alternatively one can drive for one & half days and then trek for three days. Besides being the only Hindu country in the world with all to myths and mysterious character. Nepal has more than one hundred different languages speaking people belonging to various cultural groups. Meeting there different ethnic groups of people for the period of rafting. Great rapids and remote location makes Arun the best river to run the fantastic white water rafting trip in Nepal is all a part of adventure.