All the latest breaking news & travel information on MEKONG DELTA travel, and browse The Independent's complete collection of articles and commentary on Mekong tours & Mekong river cruises: The visiting places, culture, history, and landscape of the majestic & mighty river in Southeast Asia - At 4,350km, the Mekong is the longest river in Southeast Asia and the 12th longest in the world. The river runs from its source deep in China's Tsinghai Province through the eastern part of Tibet. From Yunnan province, it becomes the border between Myanmar and Laos, and between Laos and Thailand, Cambodia and Dong Bang Song Cuu Long ( Mekong River Delta) of Vietnam.