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
Roosevelt River Roosevelt River The Roosevelt River (Rio Roosevelt, sometimes Rio Teodoro) is a Brazilian river, a tributary of the Aripuanã River about in length. The Roosevelt River begins in the state of Rondônia and flows north through tropical rainforest. It is fed by the Capitão Cardoso River, which meets it at the state boundary. In Mato Grosso the river forms the western boundary of the Guariba-Roosevelt Extractive Reserve, a sustainable use unit created in 1996. After entering Amazonas the river forms the border between the Manicoré State Forest, a sustainable use conservation unit created in 2005 and the Guariba State Park,