People float easily in the Dead Sea because its water contains an extremely high concentration of salt and minerals, making it much denser than ordinary freshwater or seawater. With a salinity of about 34%, the Dead Sea is nearly ten times saltier than the ocean, so the dense water provides greater buoyancy, allowing people to float with very little effort. The Dead Sea has no outlet, and water leaves only through evaporation, causing salts and minerals to become highly concentrated over thousands of years. Located about 430 metres (1,410 feet) below sea level, it is also the lowest exposed land elevation on Earth. Although famous for effortless floating, the Dead Sea cannot support fish or most aquatic life because of its extreme salinity, which is why it is called the "Dead Sea." In the Bible, this region is closely associated with the destruction of Sodom and Gomorrah (Genesis 19), making it both a remarkable natural wonder and an important biblical location.