The Tapi River is the longest river in southern Thailand. The river originates at the Khao Luang mountain in Nakhon Si Thammarat Province, and has a wide estuary into the Gulf of Thailand at Bandon Bay near the town of Surat Thani. It has a length of 230 kilometres.
The river drains an area of 5,460 square kilometres and in 1997 had a yearly discharge of 135.4 cubic metres per second or 4.3 cubic kilometres per year. The Phum Duang River (or Khiri Rat River), which drains another 6,125 square kilometres west of the Tapi watershed, joins the estuary 15 kilometres west of Surat Thani in Phunphin District.
Source: Wikipedia
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