Sofra Cistern

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La sofra is a huge Roman underground cistern installed in the 11th century . It is located northeast of Souk el Reba . This water supply encloses a large Byzantine church . It is entered through an iron gate on the northeastern side , but this battered old metal door is often locked . They have the capacity to contain 3 , 000cu . m/660 , 000gal . The columns of the church rise from the black waters—a view you should not miss .