The Dead Sea is a salt lake between the West Bank and Israel to the west, and Jordan to the east. At 420 metres (1,378 ft) below sea level, its shores are the lowest point on the surface of the Earth that are on dry land. At 330 m deep (1,083 feet), the Dead Sea is the deepest hypersaline lake in the world. It is also the world's second saltiest body of water, after Lake Asal in Djibouti. With 30 percent salinity, it is 8.6 times saltier than the ocean . Israeli experts say it is nine times saltier than the Mediterranean Sea (31.5% salt versus 3.5% for the Mediterranean). The Dead Sea is 67 kilometres (42 mi) long and 18 kilometres (11 mi) wide at its widest point. It lies in the Jordan Rift Valley, and its main tributary is the Jordan River.