Mekong River The Mekong River is an international river originating in the Tibetan Plateau. It flows through southern China, eastern Myanmar, northern and northeastern Thailand, Laos, and Cambodia before emptying into the South China Sea in southern Vietnam. The Mekong is the longest river in Southeast Asia and one of the largest rivers in the world. Its total length is 4,173 kilometers, divided into the Upper Mekong (approximately 1,800 kilometers) and the Lower Mekong (approximately 2,373 kilometers). The Lower Mekong basin covers an area of 591,000 square kilometers, with 178,080 square kilometers belonging to Thailand, including the Kok River basin. The Tonle Sap River Basin, the Mekong River Basin (North), the Mekong River Basin (Northeast), the Mun River Basin, and the Chi River Basin comprise 195,060 sq km in the Lao People's Democratic Republic, 152,440 sq km in Cambodia, and 65,420 sq km in the Socialist Republic of Vietnam.
