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The Arch of Constantine seen from the Colosseum. The foundation of the Meta Sudans is visible in the brown circular region just in front of the arch.

The Meta Sudans (Latin: "sweating meta") was a large monumental conical fountain in ancient Rome.

The Meta Sudans was built some time between 89 and 96 under the Flavian emperors, a few years after the completion of the nearby Colosseum. It was built between the Colosseum and the Temple of Venus and Roma, close to the later Arch of Constantine, at the juncture of four regions of ancient Rome: regions I, III, IV, X (and perhaps II).

A meta was a tall conical object in a Roman circus that stood at either end of the central spina, around which racing chariots would turn. The Meta Sudans had the same shape, and also functioned as a similar kind of turning point, in that it marked the spot where a Roman triumphal procession would turn left from the via Triumphalis along the east side of the Palatine onto the via Sacra and into the Forum Romanum itself.

The Meta Sudans was built of a brick and concrete core, faced with marble. It seems to have "sweated" the water, rather than jetting it out the top. This may mean that it oozed out the top, or perhaps that water came from holes in its side. The monument is estimated to have stood up to 17m high; until the 20th century, its concrete core was still over 9m high. It had a base pool 16m wide and 1.4m deep.

The fountain was obviously damaged in the Middle Ages because it already appears as a ruin in early views of the Colosseum. Photos from the end of the 19th century show a conical heap of bricks next to the Arch of Constantine. The ruins of Meta Sudans survived until the 20th century. In 1936, Mussolini had its remains demolished and paved over to make room for the new traffic circle around the Colosseum. A commemorative plaque was set in the road. Although the above-ground structure is gone, its foundations were later re-excavated, revealing the extensive substructure. After another excavation in 1997-98 the traffic circle was closed and the area became a pedestrian district.

• Coarelli, Filippo, Guida Archeologica di Roma, Arnoldo Mondadori Editore, Milano, 1989, ISBN 88-04-11896-2.
• Claridge, Amanda, Rome: An Oxford Archaeological Guide, Oxford University Press, New York, 1998, ISBN 0-19-288003-9.

• Meta Sudans article on LacusCurtius web site.
• Conjectured reconstruction of the Meta Sudans