The Asahan river is mostly unknown by the majority of the kayakers. It's flowing out of the dam on the Lake Toba, a old super vulcano in North Sumatra - Indonesia.
This wonderful river flows all year at the same level. The warm temperature and the quality of the whitewater makes the Asahan a very spectacular place where to spend 2 weeks.
To reach the Asahan river it's possible to fly to Medan, the main town of the island and organize a bus or a car to reach this place. https://goo.gl/maps/eu4Jy9dfwez