The Mekong River is the longest river in Southeast Asia. With a length of 4,350 kilometers, Laos was bordering the Mekong River as well. And the Mekong River for commuting as well. Scenery along the banks reflects the lifestyle of the Lao people. And natural beauty Fresh air Makes Trips Mekong River is popular among tourists. The route starts at the beginning and end of Huay Xai to Luang Prabang. Or is a departure from Luang Prabang - Huay Sai time.