The secret of “Blue Sea Asia”: People are destroyed fourth largest lake in the world and create a disaster !!!! Aral Sea was the fourth largest in the world. Due to its beauty it is called the Blue Sea Asia. However, for a few decades, people were able to destroy this jewel of nature. Aral Sea, which means “Sea Island” due to persistent over 1500 islands that protrude from the water, the salt lake on the border of Kazakhstan and Uzbekistan with an area of approximately 33,800 km².