Phare du Four

Phare du Four rises straight out of a granite reef off Porspoder, on the exposed western tip of Finistère in Brittany, right at the edge of the Iroise Marine Nature Park. The tower guards the northern entrance to the Chenal du Four, the narrow and notoriously tricky passage between the mainland and the Molène archipelago that sailors have used for centuries to avoid the open Atlantic.

Where exactly does the lighthouse stand?

Four isn't perched on a cliff or a proper island — it sits on a bare rock reef roughly 25 metres across and barely 12 metres high, rising from the sea between the Saint-Laurent peninsula and the Argenton rocks. This stretch of coast counts among the most demanding in all of Brittany: fierce currents, shallow reefs and fast-changing weather have made the lighthouse an indispensable landmark for anyone navigating the channel.

How was it built, and why did construction take so long?

The idea of lighting both ends of the Chenal du Four took shape in the early 1860s, with the first surveys of the Four rock carried out in 1862. Actual construction didn't start until 1869, and it dragged on for five years — unusually long for a lighthouse of this size — because crews could only land on the reef in calm weather, and storms repeatedly undid what had already been built. The stone tower, standing about 28 metres above sea level, was finally lit on the night of 14–15 March 1874. It went up almost in parallel with its twin, the Pierres Noires lighthouse, built south of the Molène archipelago at the same time, the pair together closing off a safer shipping corridor along this coast.

What tragedies has the lighthouse seen?

Four's history carries a heavy human cost that says a lot about how dangerous the site really was. Even before completion, a wave capsized the supply boat during construction, drowning three men: Hervé Jézéquel, François Leborgne and foreman Le Brelivet. In 1913, one of the keepers died after inhaling fuel fumes inside the tower. Then in December 1978, the supply vessel Ouessantine capsized during a routine resupply run, killing Martin Perreaux and Jean-Yves Kernoas. These losses are still part of the local memory of what it cost to keep a light burning on such an isolated rock.

How does the lighthouse operate today?

Phare du Four has run fully automatically since 6 October 1993, with no keepers left on site. Before that, over more than a century of service, roughly thirty keepers rotated through the post across generations. The lighthouse is now a listed historic monument (monument historique) and still functions as an active aid to navigation for vessels threading the Chenal du Four. Its 150th anniversary was marked in 2024.

How do you get there, and where's the best view?

Because it stands on an exposed offshore reef, there's no way to land on it or go inside — the lighthouse is strictly a sight to admire from land or from the water. The best vantage point is the Saint-Laurent peninsula in the commune of Porspoder, where on a clear day the tower stands out sharply against the horizon, especially at sunset. Many visitors and sailors also join boat trips along the Iroise coast that pass close to the Four reef, which is the best way to grasp just how exposed a spot this was to build on.

Frequently asked questions

Can you go inside Phare du Four? No. It stands on an isolated offshore reef, runs fully automatically, and is not open to visitors.

Where's the best place to see it from? The Saint-Laurent peninsula in Porspoder offers the best land view, and boat trips along the Iroise Marine Nature Park coast pass near the reef itself.

Since when has it been automated? Since 6 October 1993. Before that, keepers were stationed there in rotating shifts for more than a hundred years.

Why is it called "Four"? It takes its name from the Roche du Four, the rock it stands on, which also gives its name to the Chenal du Four passage it marks.