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Mekong Island, Don Det. The Si Phan Don (4,000 Islands) Is A Riverine Archipelago Located In The Mekong River In Southern Laos (Champasak Province). Si Phan Don Is Characterised By Numerous Islands, Half Of Which Are Submerged When The Mekong River Is In Flood. The Principal Islands Of Si Phan Don Are Don Khong (The Largest), And Don Det And Don Khon.