Rafting · Nepal
Sun Koshi River Rafting
The Sun Koshi is Nepal's classic river journey — a week-long, 270 km descent of Grade III-V water from the middle hills down to the Terai plains.
The Sun Koshi is Nepal's classic river expedition, often called one of the world's ten best multi-day raft trips. Over about a week it carries you roughly 270 km from the middle hills near Kathmandu down to the Terai plains, mixing relaxed floating with powerful Grade III–V rapids. It is the definitive Nepali river journey.
Overview and difficulty
Graded III to V, the Sun Koshi, the "River of Gold", starts gently and steadily grows in power. The early days warm you up, while the lower gorges deliver the biggest water, including famous rapids such as Harkapur, Dead Man's Eddy and Jaws. It is a big-volume river rather than a steep, technical one, which makes the rapids exciting but generally forgiving with a good guide.
Length, days and access
The full trip runs 7 to 9 days over around 270 km, with put-in near Dolalghat about three hours east of Kathmandu and take-out far downstream at Chatara in the eastern Terai. It is a true point-to-point journey, so you cross a large slice of the country by water. See getting around Nepal for arranging the return.
Season
Autumn (October to November) is the prime season, with high, lively post-monsoon water. Spring (March to early May) offers a warmer, lower-water run. The monsoon makes the river dangerously high, and winter brings colder water and smaller rapids.
What to expect
Days settle into a rhythm of paddling, swimming, floating past terraced hillsides and villages, then camping on broad sandy beaches each night. As the river descends the scenery shifts from green hills to the open plains, and the rapids grow before easing near the end. The length builds real camaraderie among the group and a deep sense of journey that day trips cannot match.
Operators and safety
Established expedition operators in Kathmandu run the Sun Koshi. Choose one with experienced guides, self-bailing rafts, full safety gear, safety kayakers and a well-organised camp and catering setup. Because you are committed for a week, logistics and emergency planning matter, so book a reputable, well-reviewed company and travel insured.
Tips
- Pack for a week of camping with sun protection, warm layers and a good dry bag.
- Build fitness beforehand; long paddling days are tiring.
- Try the Trishuli first if you want a taste before committing.
- Compare it with the Karnali and Tamur in our rafting in Nepal overview.
Frequently asked questions
What grade is the Sun Koshi River?+
The Sun Koshi is graded III to V. It starts gently and builds, with the biggest rapids in the lower gorges, including well-known drops like Harkapur and Jaws. Overall it is a big-volume river that suits fit rafters happy to be on the water for several days.
How many days is the Sun Koshi rafting trip?+
The full Sun Koshi expedition takes about 7 to 9 days and covers roughly 270 km, making it one of the longest river trips in Nepal. That includes several days of rafting and camping as the river changes from hill scenery to the open Terai plains.
Where does the Sun Koshi rafting trip start and finish?+
It puts in near Dolalghat, about three hours east of Kathmandu, and finishes far downstream at Chatara in the eastern Terai. The point-to-point nature means you travel a long way across the country by river rather than road.
When is the best season for the Sun Koshi?+
Autumn (October to November) is prime, with high post-monsoon water and powerful rapids. Spring (March to early May) gives a warmer, lower run. The monsoon makes the river dangerously high, and winter water is colder with smaller rapids.
Is the Sun Koshi good for first-time rafters?+
It can be, with the right operator. The river eases you in gently before the bigger rapids and the long days build confidence, but it is still a committing multi-day expedition. Reasonable fitness and a willingness to camp for a week are more important than prior experience.
