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In the 1950s the Soviet Union decided to cultivate cotton in the region, and since the early 1960s the Syr Darya and Amu Darya have been used for large-scale irrigation, causing a drop in the flow of freshwater into the sea. The sea is, as a result, now greatly reduced, mainly occupying three basins in the central, western, and northern sections of its lakebed. It is about a third of its former size in area and less than an eighth in volume.
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