The salinity of the Dead Sea is extremely high, generally around 34.2% (342 grams per liter), which is about 9.6 times saltier than typical ocean water. The salinity can vary slightly with depth and location in the sea, with surface waters having slightly less salinity (around 30%) and deeper waters exceeding 34%. This high salt concentration makes the water very dense, allowing people to float easily, and excludes most forms of life except certain bacteria.