How was Lake Sarez created in the Murgab River valley?

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Lake Sarez, located in the Pamirs mountain region, was created in the Murgab River valley when a massive landslide blocked the river's flow. This landslide was likely triggered by an earthquake. Unlike many other lakes formed by similar blockages, which may be temporary due to the erosion of the damming material, Lake Sarez is considered stable.12