The best replacement for dead sea is great salt lake.

The best alternatives to dead sea are rated as following:
★★★★★  great salt lake
★★★★  red sea
★★★  sea of galilee
★★  salt sea
★★  lake
★★  death valley
★  black sea
★  babbling brook
★  epsom salt
★  salt lake
  salton sea
  galilee

Your alternative for dead sea is not listed? Suggest!
Speaking about dead sea, one probably shouldn't forget about sea of galilee.

Other search terms related to dead sea and their ratings are:
★★★★★ sea of galilee
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dead sea
great salt lake
red sea