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
Little Brosna River Little Brosna River The Little Brosna River ("An Bhrosnach Bheag" in Irish) rises near Dunkerrin, County Offaly, Ireland. It flows for 36 miles before joining the River Shannon. The river rises near Dunkerrin, and enters the River Shannon near Victoria Lock, Clonahenoge. It flows over an area of limestone then passes through an area of Callow before merging with the Shannon. It forms part of the boundary between County Offaly and County Tipperary. Sharavogue Bridge built in the early 1850s carries the R492 road over the river which here forms the boundary between the townlands of Sharavogue and Ballincor Demesne.