Past sea level has varied by somewhat more than a hundred metres. This is primarily due to the growth and decay of ice sheets (mostly in the northern hemisphere) with water evaporated from the sea. The Mediterranean Basin's gradual growth as the Neotethys basin, begun in the Jurassic, did not suddenly affect ocean levels. While the Mediterranean was forming during the past 100 million years, the average ocean level was generally 200 metres above current levels. However, the largest known example of marine flooding was when the Atlantic breached the Strait of Gibraltar at the end of the Messinian Salinity Crisis about 5.2
Red Sea–Dead Sea Water Conveyance number of international donors. The water level in the Dead Sea is shrinking at a rate of more than one metre per year, and its surface area has shrunk by about 30% in the last 20 years. This is largely due to the diversion of over 90% of the water of the Jordan River. In the early 1960s, the river moved 1,500 million cubic metres of water every year from the Sea of Galilee to the Dead Sea. Dams, canals, and pumping stations built by Israel, Jordan and Syria now divert water for crops and drinking, and have reduced the