The river rises near Tibet and is joined by the BhoteKoshi just downstream from Barabesi. Most raft trips start at Dolalghat. The Sun Koshi flows eastwards in Nepal through the great valley between the Mahabharat Lekh mountains and the Himalayas.

The volume increases considerably draining flows from its Himalayan tributories. In November, the flow at Dolalghat is about 100 cumecs. Lower down the river, through the big rapids of the Jungle Corridor, it would be about 400 cumecs, which is appr. 11,000 cft., a typical low flow on the Grand Canyan of the Colorado.

At the end at Chatra, the flow is a super 800 cumecs, in November, which makes it one of the major rivers of the world in monsoon.

A nice thing about Sunkosi is that the general standard of the river gets progressively harder as you descend it to practice your skills on easy water before the more interesting, bigger and continuous rapids lower down the river.

Profile
From Dolalghat  :  Alt. 620 m.
To Chatra  :  Alt. 115 m.
Distance  :  272 km.
River Days  :  6 - 10 days
Difficulty in November  :  Class 4- (5-)
From Kathmandu  :  3 hours
Average gradient  :  0.2 % ( 10 ft a mile )
Est. max. gradient  :  0.6 %
Volume in November  :  400 cumecs
Best season  :  Oct. - Dec. and March - May

10 days rafting
Day 01  Drive from kathmandu to Dolalghat and raft to Taramg Gaon,Timal Bensi camp.

Day 02  Raft Timal Bensi to Rosho Khola near Dunja village.

Day 03  Raft from Dunja village to the village of khurkot.

Day 04  Raft from khurkot to oxbox section beach.

Day 05  Raft oxbox section to the confluence of Dudh koshi.

Day 06  Raft from dudh koshi juction to rasuwa khola.

Day 07  Raft from boeard beach bordered by a 400 ft high waterfall or kampu Ghat.

Day 08  Raft from Tribenighat ,where the Arun and Tamur join the sun koshi.

Day 09  Raft to Chatara,end of the rafting .Drive to Dharan in the afternoon.

Day 10  Drive Back to kathmandu or Fly out from Biratanagar.