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Nepalese river can be grouped into three categories on the
basis of their origin.
(1) antecedent to Himalaya
(2) After the Mahabharata and
(3) After the Churia range.
Antecedent River belongs to the period to the rise of the
Himalaya. These rivers added their tributaries during or
after the Himalayan origin along with the development of
monsoon climate. After the formation of Mahabharata hills,
the antecedent rivers changed their courses as Mahabharata
stood as a barrier. As a result, most of the river changed
their courses either to the east or west. Most of these
rivers were responsible to deposit the sediments in the
Churia basin.
The major river system namely the Koshi, the Karnali and the
Gandaki belong to the antecedent group. Rivers originating
from the Mahabharata range and cutting through Churia hills
come under the second group; these include Kankai, Bagmati,
Kamala etc. The third groups of rivers originate from the
southern face of the Churia hills.
For the purpose of commercial rafting, the following rivers
are in use.
1. Saptakoshi River System (east Nepal)
2. Narayani or Saptagandaki River System (central Nepal)
3. Karnali River System (west Nepal)
Eight Rivers in the three systems are open for tourist for
river rafting. The rivers are the Trishuli, the Kaligandaki,
theBheri, theSeti, The Sunkoshi, Karnali, Tamakoshi and the
Arun. Rafting in any other river than these requires a
special permit. The Trishuli is most popular river for
rafting followed by the Sunkoshi. The Trishuli has been so
popular because of its accessibility by road along its major
part. A Trishuli trip can be easily managed to end at a
place where a wildlife tour begins.
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