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Lake Sarez is a natural dam in Tajikistan's Pamir Mountains, formed in 1911 by a massive landslide that blocked the Morghab River. This landslide created the Usoi Dam, the world's tallest natural dam, standing at approximately 567 meters (1,860 feet). The dam impounds Lake Sarez, which holds a significant volume of water, estimated at over 16,000 cubic kilometers (13,000 million acre-feet). The lake is located in Tajikistan, a country known for its dense river network, including tributaries of the Amu Darya and Syr Darya rivers.12

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