Remeasurement of δD in Dead Sea waters, using improved analytical techniques for handling concentrated brines, removed most of the scatter in previous data and showed close parallelism in the enrichment of both 18O and deuterium as a function of salinity. The δD values for a brine whose salinity is σ25 = 232%. is close to +9%. relative to SMOW. It was further established that the concentration to activity correction (for deuterium) for the above mentioned Dead Sea brine was 17.8%..