The Dead Sea is one of the most famous places in Israel. It is the lowest place on land in the world, more than 400 meters below sea level. Its water is many times saltier than the water in the ocean. But why is it so salty?
The answer is simple. Water from the Jordan River and from small streams flows into the Dead Sea. This water carries a little salt with it. However, no river flows out of the Dead Sea. The weather there is very hot and dry, so a lot of water evaporates into the air. The water goes up, but the salt stays behind. This has happened for thousands of years, so the salt has slowly built up.
Because the water is so salty, people can float on it easily, like on a mattress. But fish cannot live there. Only some very tiny living things can survive in it. That is how the sea got its name.