Sun Koshi River Sun Koshi is second offering for expedition rafting. With a put in point only three hours from Kathmandu, it is more easily accessible then other river. Nevertheless, it offers an incredible stretch of exhilarating white water. The run is 270 km. And require 8-10 days to complete with road access only at the beginning and end. The warm water of Sun Koshi, there are dozens of adrenaline pumping big torrents and miles of calm water to replicate on this beautiful area with surroundings. There is not any road and town between starting and ending point. The classic monsoon madness high water Sun Koshi-we only run Sun Koshi in the fall and summer when high flows makes it a classic river, an outstanding trip for intermediate and advanced Kayaker. Sun Koshi means "River of gold" perhaps named after the gold, that is found from the river gravel or alternatively it refers to the orange color of the water in the monsoon when it is thick with flood.