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In the winter of 1911, a massive rock slide in the Pamir
Mountains of southeastern Tajikistan completely blocked the valley of the
Bartang (Murgab) River, a headwater tributary to the Amu Daraya River
basin. The Usoi landslide dam, named after the village of Usoi, which was
completely buried by the slide, has a total volume estimated of
approximately 2 km3, with a maximum height above the original valley
floor of 500-700 m. A lake quickly formed behind the Usoi dam, rising at a
rate of approximately 75m/year during the first few years. This lake was
named after the name of the village of Sarez, drawned by the rising water. Lake Sarez is
now more then 60 km long.
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