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The Mekong is a trans boundary river in Southeast Asia It is the world s twelfth longest river 2 and the seventh longest in Asia Its estimated length is 4 350 km 2 703 mi 2 and it drains an area of 795 000 km2 307 000 sq mi discharging 475 km3 114 cu mi of water annually 3 From the Tibetan Plateau the river runs through