Roman Aqueduct of Samos – Agiades & Pythagoreio

💧 The major water-supply system of Roman Samos

In the inland area north and west of Pythagoreio, remains survive of a second major water-supply system of ancient Samos: the Roman Aqueduct.

Centuries after the construction of the famous Eupalinos water-supply system, the Romans developed a new network for carrying water toward the city. Unlike the Eupalinos project, much of which was underground, the Roman aqueduct included above-ground masonry sections and arched structures that followed the natural shape of the terrain.

The surviving remains represent a lesser-known but highly interesting chapter in the history of ancient engineering on Samos.

📍 Location & route

The Roman Aqueduct is not a single monument located at one specific point. It was a linear engineering work extending for several kilometres, of which only scattered sections survive today.

Official material for the UNESCO site of Pythagoreio and the Heraion states that the Romans constructed a new above-ground masonry aqueduct with arches, carrying drinking water from a spring in the Myloi area toward the ancient city of Samos, present-day Pythagoreio.

Specialised research on the aqueduct has examined several possible water sources and considers the area of the Zastano spring, north of Myloi, a strong possibility, although the exact route and every stage of the original system have not been reconstructed with complete certainty.

🏛️ A system different from the Eupalinos Aqueduct

The Roman Aqueduct should be clearly distinguished from the Eupalinos Aqueduct.

The Eupalinos system was constructed in the 6th century BC and carried water from the Agiades spring toward the ancient city through a network more than 2.5 kilometres long, with its most famous section being the 1,036-metre tunnel cut through Mount Kastro.

By Roman times, however, the needs of the city had changed. Ancient Samos now included large installations such as the Thermae, which required considerable quantities of water, and a new supply system was developed from a different direction.

The construction of the Roman aqueduct was therefore closely connected with the increased water demands of the Roman city.

🏗️ Above-ground channels and arches

One of the main features that distinguishes the Roman system from the Eupalinos project is the use of masonry channels above ground and arched supports.

Where the terrain allowed, the water channel could follow the natural slope of the landscape. Across depressions and small ravines, however, additional structures were required to maintain the necessary elevation and ensure a continuous flow of water.

Sections of the aqueduct infrastructure still survive southwest of Mount Kastro, west of Pythagoreio, together with masonry channels and other traces along its former route.

💦 The power of gravity

Like most ancient aqueducts, the system relied on gravity flow.

The water had to begin at a higher elevation and follow a carefully controlled downward gradient toward the city. Too steep a gradient would have increased the speed of the water and caused erosion or damage, while too little gradient — or a reverse slope — would have interrupted the flow.

Designing such a system across kilometres of hills, slopes and depressions therefore required precise knowledge of the terrain and careful engineering.

🛁 The need for more water in the Roman city

The Roman period significantly changed the water requirements of ancient Samos.

Large public Thermae, baths and other urban installations required a stable water supply on a scale far greater than ordinary domestic consumption.

Official documentation for Pythagoreio specifically links these developments: the Romans constructed large public bathing installations and, at the same time, created the new above-ground aqueduct that carried water from the Myloi area.

The Roman Aqueduct was therefore not an isolated technical work. It formed part of the wider transformation and development of the city during Roman times.

⏳ When exactly was it built?

The existence of the aqueduct during the Roman period is well documented. Its exact date of initial construction, however, is less certain than that of some other monuments on Samos.

For this reason, it is more accurate to describe it simply as a Roman-period engineering work rather than assigning it to a specific emperor or exact century without sufficient archaeological evidence.

Modern research continues to examine its route, possible water sources and different phases of use.

🧱 What survives today

Most of the aqueduct does not survive as one continuous structure.

Its route crossed a large area, and many sections have been destroyed, buried beneath the ground or absorbed into the modern rural landscape. In certain locations, however, masonry supports, sections of channels and arched structures remain visible.

One particularly interesting area lies around Agiades, close to the ancient underground quarries already documented on Go Samos.

Local hiking routes sometimes combine the ancient quarries, remains of the Roman aqueduct and the northern area of the Eupalinos Tunnel within the same archaeological landscape.

🥾 Access & visiting the site

The Roman Aqueduct does not operate as an organised archaeological site with a single main entrance.

The surviving sections are located in rural and semi-mountainous areas, and access to some of them may involve dirt roads or footpaths.

For this reason, navigation should lead visitors to a specific visible surviving section rather than to a general point somewhere in Pythagoreio.

Visitors should wear suitable footwear and approach the remains with care, particularly where the route passes through uneven terrain.

👀 What visitors can see

Visitors should not expect a huge, fully preserved aqueduct comparable to structures such as the Pont du Gard in France.

The value of the Roman Aqueduct of Samos lies in reading the landscape itself: surviving masonry channels, structural supports, arches and traces of a route that once linked inland water sources with a thriving ancient city.

The relationship with the other hydraulic works of the area is particularly interesting. Within a relatively small geographical zone, visitors can encounter the ancient quarries of Agiades, the water-supply system of Eupalinos and remains of the later Roman aqueduct.

Together they form successive chapters in the history of ancient engineering on Samos, from the Archaic period to Roman times.