All the minerals of the surrounding area get washed into one pool, which in turn gets baked by the sun. The salts are concentrated so much, it's 10 times as salty as the ocean.
he Dead Sea region is very dry! It receives less than 4 inches of rain each year. Most of the water in the Dead Sea enters via the Jordan River as freshwater. Like many other places in the Middle East, though, this area is very hot. The water evaporates rapidly, leaving behind any salt or minerals that it contained. Since there are no outlets from the Dead Sea to the ocean, the Dead Sea grows saltier and saltier. The water is so salty that no plants or fish can survive in the waters – hence the name “Dead Sea.” In Hebrew, the sea is called Yam HaMelah, which means “Salt Sea.”