The Yerebatan Sarnıcı (also Yerebatan Sarayı, often called "Sunken Palace" called) is located west of the Hagia Sophia in Istanbul and is one of the most impressive sights of the city. The 138 m long and 65 m wide underground cistern was in its present state between 532 and about 542 under Emperor Justinian as a water reservoir for the Great Palace created. It was a great basilica, so the cistern also called Cisterna basilica. It has a capacity of approximately 80,000 cubic meters. Twelve sets of 28, totaling 336 each 8 feet high columns with Corinthian Spolienkapitellen predominantly bear the vault.
Cistern is a giant construction located in a rectangular area. Inside this cistern, into which you descend with 52 stone steps, are found 336 columns each 9 meters high and 4.80 meters apart. This cistern that was laid on an area of total 9.800 m2 has the capacity. The water that is in the best quality from the Belgrade Forest in the highlands in the west of Istanbul has served to supply the imperial household.