The Dead Sea, also called the Salt Sea, is a salt lake bordering Jordan to the east, and Palestine and Israel to the west. Its surface and shores are 427 metres (1,401 ft) below sea level, Earth’s lowest elevation on land. The Dead Sea has attracted visitors from around the Mediterranean basin for thousands of years. Biblically, it was a place of refuge for King David. It was one of the world’s first health resorts (for Herod the Great). The Jordan River is the only major water source flowing into the Dead Sea. The Dead Sea zone’s aridity is due to the rainshadow effect of the Judaean Mountains.