The Tabqa Dam (Arabic: سد الطبقة‎), or al-Thawra Dam as it is also named (Arabic: سد الثورة‎, literally dam of the revolution), is an earth-fill dam on the Euphrates, located 40 kilometres (25 mi) upstream from the city of Ar-Raqqah in Ar-Raqqah Governorate, Syria. The dam is 60 metres (200 ft) high and 4.5 kilometres (2.8 mi) long and is the largest dam in Syria. Its construction led to the creation of Lake Assad, Syria's largest water reservoir. The dam was constructed between 1968 and 1973 with help from the Soviet Union. At the same time, an international effort was made to excavate and document as many archaeological remains as possible in the area of the future lake before they would be flooded by the rising water. When the flow of the Euphrates was reduced in 1974 to fill the lake behind the dam, a dispute broke out between Syria and Iraq that was settled by intervention from Saudi Arabia and the Soviet Union. The dam was originally built to generate hydroelectric power, as well as irrigate lands on both sides of the Euphrates.