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The aqueduct usually called that of Valens was actually completed in 368 during the reign of this emperor, but certainly planned and begun already in the time of Constantine the Great (died 337) or his son Constantius.

Now nothing more than a scenic overpass for cars traveling down Atatürk Boulevard, the Valens Aqueduct ,with Turkish name Bozdoğan Aqueduct, is an aqueduct with double-tiered arches, which stretched the little valley between the two hills (Fatih and Süleymaniye) of the seven city hills Istanbul, was originally over 1,000 m long and 26.5 m high in the middle. The impressive structure, still intact, has today a length of 800m and a maximum height of only 20 m, since the surrounding ground level has risen up to 6 m. It transported water, that came from two different supply systems, over the little valley between the fourth and third hill of the city The aqueduct was in use throughout the Byzantine and most of the Ottoman time for a total of 1,500 years..

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