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
Burma Railway Thanbyuzayat in Burma, linking up with existing railways at both places. Its route was through Three Pagodas Pass on the border of Thailand and Burma. of the railway were in Burma and the remaining were in Thailand. The movement of POWs northward from Changi prison in Singapore and other prison camps in Southeast Asia began in May 1942. After preliminary work of airfields and infrastructure, construction of the railway began in Burma on 15 September 1942 and in Thailand in November. The projected or goal completion date was December 1943. Most of the construction materials, including tracks and sleepers, were