The Piscina Mirabilis is an ancient Roman cistern on the Bacoli hill at the western end of the Gulf of Naples, southern Italy. It was one of the largest ancient cisterns  and was situated there in order to provide the Roman western imperial fleet at Portus Julius with drinking water.
The cistern was dug entirely out of the tuff hill and was 15 metres (49 ft) high, 72 metres (236 ft) long, and 25 metres (82 ft) wide. The capacity was 12,600 cubic metres (440,000 cu ft). It was supported by vaulted ceilings and a total of 48 pillars. It was supplied with water from the main Roman aqueduct, the Aqua Augusta, which brought water from sources in Serino near Avellino, 100 kilometres distant, to most of the sites around Naples.
The ancient cistern is currently in private hands, but it may be visited by the public.
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