Phare de Tréhiguier

Phare de Tréhiguier is a small maritime lighthouse standing in the village of Tréhiguier, part of the municipality of Pénestin in Morbihan, on the left bank of the Vilaine estuary. It no longer guides ships, but its square tower with a slate pyramidal roof remains one of the most recognisable landmarks along this stretch of the Breton coast.

Where is it and how do you get there?

The lighthouse sits right on the edge of Tréhiguier harbour, a small fishing settlement within Pénestin, close to where the Vilaine river meets the Atlantic. The area is popular with visitors exploring La Roche-Bernard and the coastline between Morbihan and Loire-Atlantique. The easiest way to reach Tréhiguier is by car, following the local road that runs along the estuary, with parking available near the harbour. From there, it's just a short walk along the quay, past fishing boats and jetties, to reach the lighthouse itself.

What will you see?

Phare de Tréhiguier is what the French call a maison-phare — a keeper's house built together with the tower, rather than a freestanding structure on an offshore rock like many open-sea lighthouses. The tower is square in section and stands about 13 metres tall, topped with a pyramidal slate roof, a detail typical of Breton coastal architecture. It was built in 1881 and put into service the following year. It worked in tandem with the Phare du Scal on the opposite side of the estuary — together the two formed a range, a front and rear light, guiding sailors safely through the narrow and often tricky channel of the Vilaine.

The lighthouse came through the difficult years of the Second World War, suffering damage during Allied bombing in December 1944, before being repaired and returning to service in 1947. In 1971 it was automated, ending the era of resident keepers on site. Shipping traffic on the Vilaine, however, kept declining, largely because of the construction of the Arzal dam, which changed the character of the river mouth. As a result, the lighthouse was permanently switched off toward the end of the 1980s.

Today the former lighthouse building houses the Maison de la mytiliculture, a small museum dedicated to local mussel farming — bouchot mussels raised along this part of the Morbihan coast. It's a good stop to learn how mussel farmers work the tidal beds at the mouth of the Vilaine before continuing your walk along the harbour front.

When should you visit?

Tréhiguier is worth adding to a longer stay in Pénestin or a day trip around La Roche-Bernard, pairing well with a visit to the Vilaine estuary and the nearby beaches. Spring and summer bring the most activity to the harbour, but a quiet autumn walk along the quay has its own charm — fewer visitors, more peace, and good light for photographing the lighthouse against the water.

Frequently asked questions

Can you climb to the top of the lighthouse? No, the tower is not open for climbing — you view it from the outside, and the building itself now houses a small mussel-farming museum.

Is the lighthouse still in operation? No, Phare de Tréhiguier stopped functioning as a navigation aid toward the end of the 1980s, after shipping traffic on the Vilaine declined following the construction of the Arzal dam.

How long does a visit take? Walking to the lighthouse and back only takes a few minutes, but with a visit to the mussel-farming museum you can easily spend around an hour there.

What else is worth seeing nearby? Combine your visit with a walk around Tréhiguier harbour, a stroll along the Vilaine estuary, and a trip to nearby La Roche-Bernard.