River systems of Thailand divides into two major branches, the " Tiền Giang" (Front River) and "Hậu Giang" (Back River). These in turn enter the South China Sea through nine estuaries. The following are the principal tributaries of Mekong River which flow through Thailand (tributaries entirely outside the Thai border not shown). The Mekong drains a considerable portion of northeast Thailand. In terms of Thai territory drained, it is second only to the Chao Phraya system. The Salawin River rises in Tibet (Tibetan: རྒྱལ་མོ་རྔུལ་ཆུ།) after which it flows through Yunnan, where it is known as the "Nujiang" River (), although either name can be
River systems of Thailand Park, Kaeng Krachan District and flows through Tha Yang, Ban Lat, Mueang Phetchaburi and empties into the Bay of Bangkok in Ban Laem District. It is long, most of which is in Phetchaburi Province. The Mae Klong River is a river in western Thailand. The river begins at the confluence of the Khwae Noi or Khwae Sai Yok and the Khwae Yai River or Khwae Si Sawat in Kanchanaburi, passes through Ratchaburi Province and empties into the Gulf of Thailand in Samut Songkhram. The Pran Buri River is in Prachuap Khiri Khan Province, on the Kra Isthmus of the Malay