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
Kraburi River Kraburi River The Kraburi River (, , ; , BGN/PCGN: myitkyina, "Kyan River"), also Kra () or Pak Chan River () is the boundary river between Thailand and Myanmar at the Kra Isthmus of the Malay Peninsula. The river has its source in the Tenasserim Hills and flows into the Andaman Sea near the Thai town of Ranong and Kawthaung (Victoria Point), Myanmar. Most notable about the river is its long and up to wide tidal estuary, which contains the largest preserved mangrove forests of Thailand. It is therefore a protected area. The Lam Nam Kraburi National Park covers most