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
Duncan River Duncan River The Duncan River is a long river in the Canadian province of British Columbia. Its drainage basin is in area. It is part of the Columbia River basin, being tributary via Kootenay Lake to the Kootenay River, which is a tributary of the Columbia River. It forms part of the boundary between the Selkirk Mountains, to its west, and the Purcell Mountains, to its east (the boundary northwards is the Beaver River). The Duncan River originates near Mount Dawson and flows south through the Purcell Trench between the Selkirk Mountains and Purcell Mountains. It flows into Duncan Lake,