Phapheng Waterfall, Laos Stock Photo

The Khone Falls and Pha Pheng FallsLbak Khaon) together form a waterfall located in Champasak Province on the Mekong River in southern Laos, near the border with Cambodia. It is the widest waterfall in the world at 10,783 metres (35,376 feet or 6.7 miles) in width from one edge of its multiple channels to the other.]The Khone Falls are the largest in southeast Asia, and are the main reason that the Mekong is not fully navigable into China. The falls are characterised by thousands of islands and countless waterways, giving the area its name Si Phan Don or 'the 4,000 islands'