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Old Hasankeyf Castle and cave houses above the Tigris River. 80% of the town of Hasankeyf will be submerged beneath 60 metres (200 feet) of water following the completion of the Ilisu hydroelectric dam, 96 kilometres (60 miles) downstream. The reservoir created by the dam will be approximately of 313 km2 (121 sq mi) and will flood several villages as well as Hasankeyf.