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Castell romà de Can Blai

Can Blai is a late-imperial Roman fort at the highest point of the Formentera isthmus, square with five towers, never finished and a Site of Cultural Interest since 1994.

Photo: Joan Gené (cropped), CC BY-SA 4.0, via Wikimedia Commons

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The Castell romà de Can Blai is a Roman fort that was never finished, standing at the highest point of the isthmus beside the road from La Savina to La Mola. The Romans laid out a square fort with five towers here at the turn of the 4th century and then, as far as anyone can tell, walked away. What remains are the foundations, which you can walk around from the roadside.

What it is

A late-imperial Roman fort built between the end of the 3rd and the start of the 4th century AD. The plan is square, about 40 m a side, with five projecting towers. Excavations in the 1970s and 1980s found the fort unfinished, with hardly any sign of occupation. It was declared a Site of Cultural Interest (BIC) in 1994.

Visiting

The foundations of the walls and the towers survive, so what you see is the footprint of the fort rather than standing walls. The square plan and the five towers are easy to read on the ground.

Getting there

The site is at the highest point of the isthmus, beside the road from La Savina to La Mola at km 10.

Nearby

Ses Platgetes is 1.4 km away and Platja des Caló 1.6 km.

Frequently asked questions

What is the Castell romà de Can Blai?
A late-imperial Roman fort built between the end of the 3rd and the start of the 4th century AD. It is square, about 40 m a side, with five projecting towers.
Was Can Blai ever used?
Apparently not. Excavations in the 1970s and 1980s found it unfinished, with hardly any sign of occupation.
What is left of Can Blai today?
The foundations of the walls and the five towers. The site was declared a Site of Cultural Interest (BIC) in 1994.
Where is Can Blai?
At the highest point of the isthmus, beside the road from La Savina to La Mola at km 10.

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On the map

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Times are estimates. Map data (c) OpenStreetMap contributors, ODbL, Protomaps. Weather by Open-Meteo.com.

RouteLengthBy bikeOn footDifficulty
15 Sant Francesc - La Mola9 km45 min135 minEasy

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formentera.com/castell-roma-de-can-blai

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