The jewel of Champassak province, Phon Phadeng Waterfall is located in east of Don Khong on the Mekong River. Further downstream, the Mekong cascades across a wide mound of rocks which slopes in curvilinear pattern and coloured rainbows as the sunlight hits the sprays.
It's the Niagara of Asia, the widest waterfall, more than 20 kilometers in width. A place where the Mekong River takes a turn before continuing its course into the South China Sea after passing through Cambodia and Vietnam. It's also renowned as a fish basin. These spectacular waterfalls render this section of the Mekong River enviable.
Despite technically being the largest waterfall in Southeast Asia, Khon Phapheng is not all that spectacular. Indeed, it's best described as a low but wide cliff that just happens to have a huge volume of water running over it. The vertical drop is highest during the March– May dry season. A tourist pavilion above the falls provides an ideal place to sit and enjoy the view. Most tourists do the falls as a package from Don Khon but it is also possible to get there by sawngthaew from Ban Hat Xai Khoun (opposite Muang Khong) or Nakasang (4000K).