The Caspian Sea is the world's largest salt lake, but millions of years ago it was even larger. Today, if you travel north from the Caspian Sea, you will walk across land that was once underwater but is now known as the Caspian Lowland Desert. Some of the region still lies below sea level and is occasionally flooded by the Caspian Sea. There are some interesting salt domes and other formations here, as well as temporary salt lakes and salt marshes.
Read more: View WWF Report