Syria's vital Tabqa Dam, the country's biggest, has become a major part of a Kurdish-Arab assault to cut off ISIL stronghold of Raqa.
Located in Raqa province, the dam is built on the 2,800-kilometre-long (more than 1,700-mile-long) Euphrates River, which flows from Turkey through northern Syria and east into Iraq.
The dam is 4.5 kilometers (2.8 miles)..
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