Correct Answer: Aral Sea

Solution : The correct answer is Aral Sea.

Aral Sea is a landlocked sea lying between Kazakhastan and Uzbekistan. It is an endorheic lake, i.e. it has underground source of water and is not getting water from any other outside sea. This lake has largely dried up and is facing an environmental crisis. It is a salt water lake and once has been the 4th largest lake of the world.