The Dead Sea shore is 1400 feet below sea level, the lowest land spot on earth. There is no outlet for the water, which flows into the Dead Sea, technically a lake, from the Sea of Galilee (also technically a lake) via the Jordan River. Water leaves the Dead Sea only by evaporation, leaving minerals behind in high concentration. Because of the extremely low elevation, the barometric pressure is higher than anywhere else on earth, there’s a greater concentration of oxygen in the air, greater filtration of ultraviolet sun rays, and the air is practically free of pollen and other allergens.
The Dead Sea has been known for its healing properties for thousands of years, and even today, the unique climactic and mineral properties are used in therapies for conditions such as psoriasis, arthritis and cystic fibrosis.