FactSentinel

The Dead Sea's extraordinary buoyancy comes down to basic physics and its unique chemical composition. Located on the border between Israel and Jordan, it has a salinity level of roughly 34 percent, nearly ten times saltier than the average ocean. This high concentration of dissolved minerals, including magnesium chloride, calcium chloride, and potassium chloride, dramatically increases the density of the water. According to the principle of buoyancy, objects float more easily in denser liquids because the water exerts greater upward force relative to the object's weight. Since the human body is less dense than Dead Sea water, people naturally bob on the surface without effort, often finding it difficult to fully submerge even if they try.

The evidence for this phenomenon is well documented by oceanographers and geologists who study the Dead Sea's unusual hydrology. The sea sits in a closed basin with no outlet, causing water to evaporate rapidly while leaving minerals behind, a process that has concentrated salts over thousands of years. This makes it one of the saltiest bodies of water on Earth, alongside a small number of other hypersaline lakes.

A common misconception is that swimming skill or body fat percentage significantly affects one's ability to float there. In reality, the water's density is so extreme that nearly anyone floats regardless of swimming ability. Visitors are typically cautioned against submerging their heads, since the salt can severely irritate eyes and mucous membranes, and swallowing the water can be dangerous.