Years ago, the Aral Sea was the world's fourth-largest freshwater lake with an area of some 26,000 square miles. But in the 1950s, it became the victim of the Soviet Union's agricultural policies. Water from its two river sources -- the Amu Darya and Syr Darya -- was intentionally diverted for cotton cultivation. The Aral Sea began to disappear and nearly completely vanished . But things have changed for good . From a report: