The lake between Israel and Jordan famous for its high salinity and buoyant waters is the Dead Sea.
The Dead Sea is a landlocked, endorheic salt lake in the Jordan Rift Valley. Jordan lies to its east, while Israel and the West Bank lie along its western shore. Its main natural inflow is the Jordan River, but it has no outlet; water leaves largely through evaporation, concentrating dissolved minerals.
Its salinity is roughly 9.6 times that of ordinary seawater in commonly cited measurements. The unusually dense water makes people highly buoyant, although swimming is difficult and splashing water into the eyes can be painful. The name reflects the lake’s harsh conditions: very few plants and animals can survive in its concentrated brine.
A common mix-up is the Great Salt Lake in Utah, which is also hypersaline and buoyant. The Dead Sea is shrinking because river water has been diverted for agriculture and drinking, and its surface is more than 400 metres below sea level—the lowest land-based elevation on Earth.