One of Istanbul's splendid historical buildings is the Basilica Cistern located in the southwest of Hagia Sophia. This large underground cistern built by Byzantine Emperor Justinian I (527-565) was named as Yerebatan Palace ere among the people due to the marble columns rising from the water and countless seemingly like. It is also known as Basilica Cistern since there is a Basilica in the place where the cistern is located.
The cistern is a giant structure covering a rectangular area of 140 meters in length and 70 meters in width. Covering a total area of 9.800 m2, this cistern has a storage capacity of approximately 100.000 tons of water.
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