This sea is really a lake. Black Caspian Dead Mediterranean

The Dead Sea is not really a sea!

Explanation:

While many think the Caspian Sea should be labeled as a lake as well, The Dead Sea is the actual lake. The Dead Sea has a high salt content, but it really is just a 50 mile lake. The Caspian Sea is known as an inland sea.

"Water flowing into the Dead Sea from the Jordan River evaporates rapidly, leaving salt and other minerals behind."