Servian Wall
In ancient Rome, the Piscina Publica ("Public Pool") was a public reservoir and swimming pool located in Regio XII. The region itself came to be called informally "Piscina Publica" from the landmark. The "piscina" was situated in the low-lying area between the Via Appia, the Servian Wall, and the northeast slope of the Aventine Hill, an area later occupied by the Baths of Caracalla.