The Hueang River (, , ) is one of the boundary rivers between Thailand and Laos. It originates in the hills of Na Haeo district, Loei Province. Outing there, it flows through Dan Sai, Phu Ruea, Tha Li districts and mouths to the Mekong River in Chiang Khan district, Loei Province. It is long, of which form the boundary. Rivers of Thailand Rivers of Laos International rivers of Asia Laos–Thailand border Tributaries of the Mekong River