Khone Phapheng Waterfall, 4000 Islands (Si Phan Don), Laos

Khone Phapheng Waterfall is the biggest waterfall in southeast Asian and is located in Si Phan Don (Four Thousand Islands) in the Champasak Province that borders Cambodia. While it is not very high, it has a succession of rapids that stretches a mighty 6 miles crashing down the Mekong River toward Cambodia. It has a well-built tourist pavilion above the falls providing an ideal place to sit and enjoy the magnificent view.