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
Tapi River, Thailand Tapi River, Thailand The Tapi (or Tapee) river (, , ) is the longest river in southern Thailand. The river originates at Khao Luang mountain in Nakhon Si Thammarat Province, and empties into the Gulf of Thailand at Bandon Bay near the town of Surat Thani. It has a length of . The river drains an area of and in 1997 had a yearly discharge of or per year. The Phum Duang River (or Khiri Rat River), which drains another west of the Tapi watershed, joins the estuary west of Surat Thani in Amphoe Phunphin. The river was named on