Fringing Jordan, the Dead Sea is a salt lake that lies in the Jordan Rift Valley. It serves as the main tributary of the Jordan River. This vast salty lake is one of the saltiest bodies of water on Earth with over 10 times as much salt in it as seawater. The Dead Sea is one of the most intriguing natural phenomena on earth. Visitors can float easily on the surface due to the high quantities of salt. This has made it a world-famous destination, popular for the healing property of salt for treating skin problems. It is the largest free spa on Earth, drawing both locals as well as visitors from all corners of the globe.