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
Geology of Myanmar India and the Eurasia Plate led to the formation of the Himalayan Orogeny. On the eastern margin of the India plate, high oblique subduction occurs between the boundary of India and the Burma-micro plate. Between late Eocene to Miocene, the Burma and Shan-Thai block rotated 30° to 40° clockwise, to accommodate the major collision along the plate boundary. This resulted in the trend of arc shifting from east-west to the north-south direction. The subduction boundary forms an accretionary prism and eventually with thrusting and folding forms the Indo-Burma Range. In late Miocene to Pliocene, the slab detachment of Burma-microplate beneath