The one that can be seen in the centre of the picture is the Aqua Claudia. This public work is one of the most remarkable of Rome. Terminated under Emperor Claudius, it fed the slopes of the Palatine (top left) and had its source in the moutains 68km far from Rome. In the centre of the picture, it goes through the CŠlian Hill and, in the middle, along the wide architectural complex formed by the Temple of Claudius.

The Emperor Domitian extended the Aqua Claudia up to the Palatine, top right, to supply the palace with water.

Detail of the Aqua Claudia going through the CŠlian Hill.

The Aqua Claudia had as well to wind amid the mansions of the CŠlian Hill.

This aqueduct in the centre of the picture is actually a double aqueduct, the Appia on the left and the Marcia on the right. The Aqua Appia diverts directly from the Aqua Claudia which we saw above, meanwhile the Aqua Marcia had its source in the big Aqua Marcia Tepula Iulia, that fed the Baths of Diocletian. These two aqueducts went therefore through the CŠlian Hill and fed the baths built on the Aventine, the Baths of Decius on the upper part of the hill and the smaller Baths of Sura towards the Circus Maximus.

Opposite the indication as to where the Aqua Alsietina goes underneath to supply with water the Naumachia of Augustus in the Trastevere.

The aqua Virgo enters Rome on the north side through the slopes of the Pincian Hill and goes until the SŠpta Julia on the Campus Martius. On the picture, you see the Arch of Claudius on the spot where the aqueduct goes over the Via Lata, completely on the left of the picture. Today this is the famous Via del Corso.

A partial view of the Aqua Virgo, just before it bends, at the top of the picture, towards the Campus Martius.

The Aqua Marcia Antoniniana is supplying the great cistern of the Baths of Caracalla.

Third Roman aqueduct, the Aqua Marcia Tepula Iulia was built between 144 and 140 BC. It enters Rome through the PrŠnestina gate (today the Porta Maggiore – the Main Gate), goes alongside the Aurelian Wall to the Tiburtina Gate then comes into the city and divides in two separate branches.

Here is the division of the two branches of the Aqua Marcia in the north-east Esquiline. The shortest is the Aqua Marcia Iovia. The two branches feed the tanks of the Baths of Diocletian, becoming underground.

The New Anio Aqueduct ( Aqua Anio Novus ) merges with the Aqua Claudia, with which it shares the same way on their 13 last kilometres before Rome. It diverges from it after the PrŠnestina Gate and feeds a great tank (Aqua conclusa). This was the longest and the one that brought the most water to Rome.