15 Interesting Facts About Cisterns of Istanbul

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  1. In the past, rainwater gathered from the roofs was collected in small cisterns in the basements of houses. Later during Byzantine and Ottoman periods, much larger cisterns were built for water collection.
  2. The cisterns, built to meet the city’s water needs, are only among historical artifacts today and they are not used for supplying water anymore. Cisterns of Istanbul are only touristic attractions today, even if there is water in them today.
  3. Great importance was given to the construction of cisterns during the Byzantine period. There are completely covered cisterns in Istanbul as well as open cisterns that looked like a large pools.
  4. The Byzantines further developed the cistern system and equipped Istanbul with more than 100 cisterns, so that it would not be deprived of water during the frequent sieges since Istanbul’s water mostly came from outside via aquaducts.
  5. In cities built by the sea, such as Istanbul, underground drinking water could be salty and cisterns were needed to collect fresh rainwater.
  6. The open cistern in Istanbul Karagümrük district is used as a football field today.
  7. Cisterns were used in the Ottoman period just like during the Byzantine period.
  8. Whether one could plant trees near a neighbor’s cistern was regulated by the law since trees such as figs had roots could penetrate the walls of the cistern and cause water to leak.
  9. The Basilica Cistern, the largest cistern in Istanbul, can hold 80,000 cubic meters of water!
  10. The number of known cisterns in Istanbul is constantly changing, as a new cisterns are diccovered time to time. It is reported that there are about 70 cisterns, although their exact number is not known today.
  11. The construction of the Basilica cistern took 38 years and approximately 7000 slaves were employed in the construction of the cistern.
  12. Turks have always preferred flowing water thats why cisterns of Istanbul lost their importance over time.
  13. You can make a wish by throwing coins into the waters of Istanbul’s cisterns!
  14. The bottom of the cisterns was brick-lined as a precaution against water leaks, and the corners were rounded or reinforced in this way to prevent leaks. In addition, the walls were plastered from the inside with a special kind of mortar to prevent water from leaking out.
  15. Thanks to advancements in cannon technology and city’s defense walls losing importance, sieges became inessential which leaded the need for cisterns to disappear.

Hasan Gülday

Hasan Gülday. Professional licensed tour guide working in Turkey. I have more than 15 years of experience in guiding and also working in various travel agencies. Having experienced all positions of travel industry made me to understand expectations of my guests and tailor made my services regarding their wishes. I currently live in Kusadasi (Ephesus) with my wife and two daughters. I will be pleased to share my experiences with you!

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