The dead sea is a significant feature of the region surrounding israel because the dead sea is

As dead sea is the "lowest land" on planet Earth, it is a significant feature surrounding Israel.

Explanation:

Dead Sea borders Jordan, Israel and the West Bank. It is the lowest point on the planet Earth. It is 420meters below the sea level. It is on the top of the Rift which lies in between Arabian and African plates. The Dead sea sinks one meter per year due to the movement of these plates. It is having the highest salinity with 30 percent of mineral salts.  

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Answerair masses develop near the equator are warm; tropical air mass