The Mekong, Vietnam and Cambodia

The Wall Street JournalFrom the barren Tibetan highlands, the Mekong river rumbles south through China's Yunnan province and winds its way along the Myanmar, Laos and Thai borders. Then it powers through Laos, Cambodia and Vietnam before emptying in the South China Sea. At 4,350 kilometers, it is the seventh longest river in Asia and, arguably, Southeast Asia's most important natural resource.