Fort de Bertheaume

Castle in Brest

Fort De Bertheaume
CC BY-SA 4.0 / Thesupermat

The Fort de Bertheaume is a historic fortress located in Plougonvelin, Finistère, perched on a rocky tidal island overlooking the Goulet de Brest. Originally used for coastal defense, the fort has played a strategic role in protecting the entrance to Brest’s harbor since the 17th century, when Vauban reinforced its defenses under the orders of Louis XIV.

The fort’s elevated position made it an ideal lookout point, allowing it to monitor naval activity in the region. Over the centuries, it underwent several modifications, including the addition of casemates, barracks, and artillery platforms. During World War II, German forces integrated it into the Atlantic Wall, further strengthening its military significance.

Today, the Fort de Bertheaume is accessible via a footbridge, making it a popular destination for visitors interested in history and adventure. The site offers guided tours, treasure hunts, and even climbing and zip-lining activities, blending heritage with outdoor exploration. Whether you’re drawn to its military past or its breathtaking coastal views, the fort remains a fascinating landmark in Brittany.


The Fort de Bertheaume appears in our Complete Guide to Visiting Brest!

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