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is an island city from the Sassanid era with a complex irrigation system, situated in Iran's Khuzestan Province.It has been registered on UNESCO's list of World Heritage Sites in 2009, as Iran's 10th cultural heritage site to be registered on the United Nation's list.Originally dating to the time of Darius the Great, an Achaemenian king of Iran, it partly consists of a pair of primary diversion canals in the Karun river, one of which is still in use today. It delivers water to the Shushtar city via a route of supplying tunnels. The area includes Selastel Castel, which is the axis for operation of the hydraulic system. It also consists of a tower for water level measurement, along with bridges, dams, mills, and basins.Then it enters the plain south from the city, where its impact includes enabling the possibility of farming over the area called Mianâb and planting orchards. In fact the whole area between the two diversion canals (Shutayt and Gargar) on Karun river is called Mianâb, an island having the Shushtar city at its northern endThe site has been referred to as "a masterpiece of creative genius" by UNESCO

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