Khone Phapheng Falls Southern Laos

At 6.7 miles wide these are the widest waterfalls in the world. And are the reason the river is not fully navigable into China. In 1866 a French party set out in steamer boats to seek a trade route up the Mekong from the South China Sea into China. They made several attempts to go around and over the falls, eventually they admitted defeat and built a narrow-gauge railway line across the islands of Don Det and Don Khone. The Khone falls also form part of the Cambodian border.

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