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
Great Tenasserim River been exported from the area due to a serious insurgency problem prevailing in the region. Great Tenasserim River Great Tenasserim River or the Tanintharyi River is a major river of southeastern Burma. It flows through the Tanintharyi Region, past the town of Tanintharyi before entering the sea at Myeik (Mergui). The river rises from the Tenasserim Range at an altitude of and flows into the Andaman Sea. The region formed by this river is also known as Tenasserim, Tanintharyi in Burmese, which is in a constricted coastal region in southeastern Myanmar (formerly Burma), which has border with Thailand on the