The Zarqa River, the second main tributary of the Jordan River, flows and empties entirely within the East Bank. A 380-kilometer-long rift valley runs from the Yarmouk River in the north to Al Aqaba in the south. The northern part, from the Yarmouk River to the Dead Sea, is commonly known as the Jordan Valley. It is divided into eastern and western parts by the Jordan River. Bordered by a steep escarpment on both the eastern and the western side, the valley reaches a maximum width of twenty-two kilometers at some points. The valley is properly known as "Al Ghawr" or "Al Ghor" (the depression, or valley). The Rift Valley on the southern side of the Dead Sea is known as the Southern "Ghawr" and the Wadi al Jayb (popularly known as the Wadi al Arabah). The Southern Ghawr runs from Wadi al Hammah, on the south side of the Dead Sea, to Ghawr Faya, about twenty-five kilometers south of the Dead Sea. Wadi al Jayb is 180 kilometers long, from the southern shore of the Dead Sea to Al Aqaba in the south. The valley floor varies in level. In the south, it reaches its lowest level at the Dead Sea (more than 400 meters below sea level), rising in the north to just above sea level. Evaporation from the sea is extreme due to year-round high temperatures. The water contains about 250 grams of dissolved salts per liter at the surface and reaches the saturation point at 110 meters. The Dead Sea occupies the deepest depression on the land surface of the earth. The depth of the depression is accentuated by the surrounding mountains and highlands that rise to elevations of 800 to 1,200 meters above sea level. The sea's greatest depth is about 430 meters, and it thus reaches a point more than 825 meters below sea level. A drop in the level of the sea has caused the former Lisan Peninsula to become a land bridge dividing the sea into separate northern and southern basins. The major characteristic of the climate is the contrast between a relatively rainy season from November to April and very dry weather for the rest of the year. With hot, dry, uniform summers and cool, variable winters during which practically all of the precipitation occurs, the country has a Mediterranean-style climate. In general, the farther inland from the Mediterranean Sea a given part of the country lies, the greater are the seasonal contrasts in temperature and the less rainfall.