The Dead Sea

It is a salt lake between the West Bank and Jordan.
At 420 metres (1,378 ft) below sea level,
The Dead Sea is 67 kilometres (42 mi) long and 18 kilometres (11 mi) wide at its widest point. It lies in the Jordan Rift Valley, and its main tributary is the Jordan River.
It was one of the world's first health resorts (for Herod the Great), and it has been the supplier of a wide variety of products, from balms for Egyptian mummification to potash for fertilizers.
According to geological theory, approximately two million years ago the land between the Rift Valley and the Mediterranean Sea rose to such an extent that the ocean could no longer flood the area. Thus, the long bay became a lake.
Current theories as to the cause of this dramatic drop in levels rule out volcanic activity, therefore it may have been a seismic event.

The Jordan River is the only major water source flowing into the Dead Sea. There are no outlet streams

The dead sea climate is warm and sunny around the year,It is atmosphere is very low poluted so it is healthy.
summer average temperature between 32 and 39 °C (90-102°F),Winter average temperatures range between 20 and 23 °C (68-74°F). The region has weakened ultraviolet radiation, particularly the UVB (erythrogenic rays), and an atmosphere characterized by a high oxygen content due to the high barometric pressure. The shore is the lowest dry place in the world. Proximity to the sea affects temperatures nearby because of the moderating effect a large body of water has on climate. During the winter months, sea temperatures tend to be higher than land temperatures, and vice versa during the summer months. This is the outcome of slow penetration of the sun's rays into the sea, which is a huge mass that takes a long time to warm up.

The region's climate and the unique conditions created by its low elevation have made it a popular center for several types of therapies:

Climatotherapy: Treatment which exploits local climatic features such as temperature, humidity, sunshine, barometric pressure and special atmospheric constituents.
Heliotherapy: Treatment that exploits the biological effects of the sun's radiation.
Thalassotherapy: Treatment that exploits bathing in Dead Sea water.
The mineral content of the Dead Sea is significantly different from that of ocean water. The exact composition of the Dead Sea water varies with season, depth, temperature and so on. The concentration of ionic species (in g/kg) of Dead Sea surface water in the early 1980s was found to be: Cl%u2212 (181.4), Br%u2212 (4.2), SO42%u2212 (0.4), HCO3%u2212 (0.2), Ca2+ (14.1), Na+ (32.5), K+ (6.2) and Mg2+ (35.2). The total salinity was 276 g/kg.[8] These results show that w/w% composition of the salt, as anhydrous chlorides, was calcium chloride (CaCl2) 14.4%, potassium chloride (KCl) 4.4%, magnesium chloride (MgCl2) 50.8% and sodium chloride (common salt, NaCl) 30.4%. In comparison, the salt in the water of most oceans and seas is approximately 97% sodium chloride. The concentration of sulfate, SO42%u2212, ions is very low, and the bromide ion, Br%u2212 concentration is the highest of all waters on Earth.
Many people believe the mud of the Dead Sea has special healing and cosmetic uses.