Flows through the town of Chiang Rai and is 130 kilometers long. Long-tailed boats can be rented from town to travel along the river, on both sides of which are lovely sceneries. Stops can be made at hilltribal villages of the Akha or Iko, Lisu, Karen, etc.

Elephant rides are also available to see the surrounding area. Another river route starts from Tha Ton in Chiang Mai going northward to Chiang Rai town. The trip takes about four hours. Trips by bamboo raft takes 3 days and 2 nights.