Mount Sodom (Jebel Usdum) is a hill along the southwestern part of the Dead Sea in Israel, part of the Judean Desert Nature Reserve. Mount Sodom began its rise hundreds of thousands of years ago, and it continues to grow taller at a rate of 3.5 mm a year.It is most remarkable because it is made almost entirely of halite, or rock salt. It is approximately 8 km long and 226 m above the Dead Sea water level.