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
Migration period of ancient Burma flowing through Yunnan and the neighboring lands of Burma, Laos, Thailand, Cambodia and Vietnam. The basins of these rivers and their tributaries form deep, narrow valleys which, with the high parallel mountain ranges running generally north and south, constitute a favourable home for numerous ethnic minorities. Yunnan shares a long common border with Burma and many ethnic groups that live in Yunnan can also be found in Burma. Burma is like a big super-highway between India and China. India and China are the world's biggest and ancient cradles of civilization. High, snow peaked, rough and steep Himalaya mountain ranges block