In the centre of the picture, between the Baths of Caracalla and the aqueducts Appia and Marcia, spread the Augustus' administrative region nr XII. This region was also called Piscina Publica, because in the past one could find there a public swimming pool where the Roman youth used to learn to swim. It was a vast reservoir at the foot of the Aventine, which was also used as a watering place for horses and washing water. The indication about the place went up to 215 B.C. The name stayed even if the swimming pool disappeared with the time going. According to plans it should have been on the spot of the House of Q. Aiacius Censorinus, which we shall see further down. From the top of the Minor Aventine, taking as a starting point the Porta Nævia, one had to take the Clivus Delphini that went down across the region to reach the Via Nova. The Vicus Fortunæ Mammosæ was as well making a link between the centre of the Clivus Delphini and the Via Nova .

Quite close to the Baths of Caracalla, the Nævia's grove in the centre right of the picture . The identification remains uncertain, as a certain Nevius may have given his name to the grove, said Nævia's, which could have been situated outside the walls of the city of Rome.

When going down the Clivus Delphini, an imposing complex of domus and gardens built on the slope of the hill was drawing attention. On the right, the gardens of Celonia Fabia and on the left the palace of L. Fabius Cilon ( L. Fabius Cilo ), who was a famous prefect of the City and finally consul in 193 then in 204. We know that he was friend of Septimius-Severus and his son Caracalla. This house may besides have been offered to him by Septimius-Severus.

Quite close to the palace of Fabius Cilo, the temple of the good goddess Subsaxana ( Bona Dea Subsaxana ). One of the deities of fertility whose cult was essentially feminine and its mysteries forbidden to men. It appears in the centre of the picture in a luxuriant environment. See as well on the right of the picture whole sections of the Servian wall still standing, which goes alongside the Saxum, the slope of the Aventine rock.

Close to the Baths was bult a fairly spacious complex with gardens, the Septem Domus Parthorum, which can be translated as the seventh house of the Parthians. . Left of the palace is the Vicus Fortunæ Mammosæ.

The House of Q. Aiacius Censorinus was a true palace right in the centre of the area of the Piscina Publica. . Its exact location remains nevertheless doubtful. It is this huge building with gardens in the centre of the picture. The Via Nova crosses the picture on the right.