What Ponza and Ventotene Tell You About the Tyrrhenian

The Pontine Islands were not, from the Roman perspective, marginal geography. They were Imperial property, located on the principal maritime route between Rome's port at Ostia and the Campanian coast, and used as places of controlled exile for members of the Julio-Claudian dynasty whose continued existence was politically inconvenient but whose execution would have been symbolically difficult. Agrippina the Elder died on Ponza in 33 CE after being exiled there by Tiberius. Her daughter Agrippina the Younger was exiled to Ponza by Caligula, then recalled and eventually murdered by her own son Nero. The islands accumulated this history partly because of their isolation and partly because of their direct access to Rome by sea.

Ventotene: The Harbour That Has Not Changed

Ventotene is the smaller of the Pontine Islands — 1.6 kilometres long, 800 metres wide, population approximately 700 — and its Roman harbour is one of the best-preserved examples of ancient Roman maritime engineering in the Mediterranean. The harbour was constructed in the first century BCE, probably under Augustus, by excavating a natural inlet in the island's northeastern coast to a depth sufficient for Roman merchant and naval vessels. The tufa walls of the harbour basin are the original Roman construction, cut directly from the island's volcanic rock. The lighthouse base, the boat houses (navalia) cut into the cliff above the harbour, and the tunnel connecting the harbour to the main Roman administrative complex on the plateau above are all substantially intact and visible on a visit of two to three hours. The harbour is still in use as a small boat anchorage today — the most direct demonstration of Roman engineering continuity available anywhere in the Tyrrhenian.

Ponza: The Fish Pools and Imperial Villas

Ponza's Roman archaeology is dispersed along the coastline but visible from the sea in a way that rewards a slow circuit of the island by boat. The Roman piscinae — the fish pools cut into the rock at sea level along the northwestern coast — are the most extensive surviving example of Roman maritime aquaculture in Italy. The pools were cut into volcanic tufa by the same process used to excavate the Ventotene harbour, then connected to the sea by channels controlled by sluice gates that regulated salinity and the entry of wild fish. The species cultivated varied by pool: moray, sea bream, sea bass, and — in the pools with the finest salinity control — the prized muraena that Pliny the Elder records as one of the great delicacies of imperial Rome.

The Roman tunnels of Ponza — particularly the Grotte di Pilato — are a series of caves connected by Roman-cut channels that served as moray eel pools associated, without historical certainty, with the Pontii family from whom the island's ancient name Pontia is derived. They are navigable by small boat through the cliff face and represent some of the most direct encounters with Roman construction available anywhere in Italy.

Ponza and Ventotene - The Boat as Method

The Roman archaeology of the Pontine Islands is not available through land-based visits. The fish pools, the sea-level cisterns, the tunnel entries, the boat house niches cut into the Ventotene cliff — these require a boat, and in most cases a boat capable of entering shallow coastal water in stable sea conditions. A private boat charter combining Ponza and Ventotene, with a guide who knows both the Roman sites and the correct approach to each, produces a visit of genuine archaeological content that is unavailable on any other format.