Salt concentration in the Dead Sea is nearly ten times higher than that of the regular ocean, making the water so dense that human beings naturally float on the surface.

Why the Dead Sea makes floating feel effortless

The Dead Sea is an inland lake with no river outlet. Water flows in, but much of it leaves by evaporation; dissolved minerals do not evaporate with it. Over time, that concentrates the lake’s salts far beyond ordinary seawater levels.

That concentration changes the water’s density. When a person is immersed, the water pushes upward with a force equal to the weight of the water displaced. Denser water weighs more in the same volume, so it provides more upward support. A swimmer therefore floats with less effort than in a typical lake or ocean—though balance still matters, and turning over can be awkward.

A landscape shaped by what stays behind

Evaporation leaves minerals behind, and when the water becomes saturated, some crystallize along the shore and lakebed. The result is a stark border of white salt formations against the water and surrounding desert—a visible record of the lake’s unusual chemistry.

The saltiness also limits familiar aquatic life: fish and aquatic plants cannot thrive there. That does not mean the lake is completely lifeless; microscopic organisms can survive in its extreme conditions. For visitors, the practical consequence is a place where floating comes easily, but splashing water into the eyes or swallowing it is a poor idea: the same concentrated salt that supports the body can sting intensely.