The Aral Sea in Central Asia is shown in this Envisat image. The Aral Sea, located on the border between Kazakhstan and Uzbekistan (to the south), is actually a lake rather than a sea. Over the last 40 years, the Aral Sea, once the fourth largest lake in the world, has evaporated to half its original surface area and a quarter its initial volume, leaving roughly a 36 000 square kilometre zone of dry white-coloured salt terrain now called the Aralkum Desert.
More at:
http://www.esa.int/esaEO/SEM22IBUQPE_index_0.html