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In page Water conflict:

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Throughout history there has been much conflict over use of water from rivers such as the Tigris and Euphrates rivers and one of the earliest known "water wars" was around 2400 BCE between the ancient Sumerian states of Umma and Lagash over irrigation water.[1] Turkey's Southeastern Anatolia Project (Guneydogu Anadolu Projesi, or GAP) on the Euphrates has potentially serious consequences for water supplies in Syria and Iraq.[citation needed] During the 1950s multiple dams and other water projects were started as a result from water sharing concerns particularly for downstream countries.[2]