The River Vietnam is a major river in Southeast Asia, and it is the 12th longest river in the world. It is also known as the Mekong River, which is its 6-letter name. The Mekong River originates in the Tibetan Plateau and flows through China, Myanmar, Laos, Thailand, Cambodia, and Vietnam before emptying into the South China Sea. It is an important source of food, transportation, and energy for the countries it passes through.