River systems of Thailand used for the whole river. The river is long. It then leaves China and meanders through Myanmar (where it is known as the "Thanlwin") and Thailand (where it is known as the "Salawin", Thai: สาละวิน) on its way to emptying into the Andaman Sea by Mawlamyaing (Moulmien). The principal tributaries of the Salawin which flow through Thailand are the Moei River and the Pai River. In addition to the Salween River, there are a number of rivers which drain into the Andaman Sea from the west coast of the Malay Peninsula. None of them are extensive enough to be considered
Peopling of Thailand through Laos. The Iu Mien arrived in Thailand approximately 200 years ago, contemporaneously with a large number of other Hmong–Mien migrants. The primary homeland of the Hmong–Mien ethnicity is said to be Kweichow, a province of southern China, where they settled at least 2,000 years ago. The Karen left Tibet and migrated to Burma as refugees, establishing themselves along the Burmese border with Thailand. When during World War II the Japanese occupied Burma, long-term tensions between the Karen and Burmese turned into open fighting. After the war ended, Burma was granted independence in January 1948, and the Karen, led by