Aral Sea: The world 4th largest sea that dried up in 40 years

The Aral Sea was once the fourth-largest lake in the world. Fed primarily by snowmelt and precipitation flowing down from faraway mountains, it was a temperate oasis in an arid region. But in the 1960s, the Soviet Union diverted two major rivers to irrigate farmland, cutting off the inland sea from its source. The Aral Sea has been slowly disappearing ever since. These images show how the Aral Sea and its surrounding landscape has changed over the past few decades.