Usoi Dam
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The Usoi Dam is a natural landslide dam along the Murghab River in Tajikistan. At 567 metres (1,860 ft) high, it is the tallest dam in the world, either natural or man-made. The dam was created on February 18, 1911, when the 7.4-Ms Sarez earthquake caused a massive landslide that blocked the flow of the river.
Usoi Dam viewed from behind. Sarez Lake is on the right, and the smaller body of water to the left is Shadau Lake. The earthen barrier separating the two lakes is not part of the dam, which is further behind in the background.