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Cisterns are reservoirs for holding water for thirsty cities. Istanbul has several, some open-air ones, like the Asparne cistern near the Yavuz Selim mosque where there used to be a place for cattle trade and now sports facilities for the surrounding neighbourhood (very nice place by the way). But also a number of covered ones, the most famous being the Yerebatan sarnıcı. I must have pictures of the Asparne cistern somewhere, once I find them I will include them here, in the mean time I only show three cisterns.