Coastline of the Dead Sea. The Dead Sea locates between Israel and Jordanian. The Dead Sea is about 15 miles from Jerusalem to the east. The Dead Sea's depth average is about 984 feet and salt content is 30-35 percent at its highest, but average is about 25 percent. The Dead Sea is one of the smallest seas in the world, and it is about 41 miles long and about 11 miles wide. The Dead Sea is about 1312 feet higher as a sea level.