Phare du Tréhic

Phare du Tréhic is a small stone lighthouse standing at the tip of a long breakwater guarding the harbour entrance at Le Croisic, on the coast of Loire-Atlantique in southern Brittany. The cylindrical tower is only nine metres tall, but its position at the very end of a wave-battered jetty makes it look far more dramatic — and turns it into one of the most photographed spots on this stretch of coast.

How do you get there?

The lighthouse sits at the far end of the digue du Tréhic, a granite breakwater almost a kilometre long that stretches out from Le Croisic harbour into the Atlantic. Le Croisic itself is easiest to reach by car or by train from Nantes (the line running toward Saint-Nazaire and Le Croisic); from the town centre and marina, it's a short walk or bike ride to the start of the breakwater. Walking out onto the jetty is free and usually possible year-round, but it's worth checking sea conditions first — in strong wind or at high tide, waves wash over the stone slabs and the walkway can become dangerous or closed to visitors.

What will you see there?

The breakwater was built between 1839 and 1844 out of granite, designed by engineer Jules Maillard de la Gournerie and built by contractor Sylvain Deslandes from Amboise. The nearly 858-metre structure was meant to tame the strong currents at the harbour mouth and around the "traicts" — the shallow tidal inlets and former salt basins typical of this part of Le Croisic. Until 1868, only a wooden marker stood at the end of the jetty; the stone lighthouse itself was built between 1869 and 1872, using dressed stone quarried nearby at Batz-sur-Mer. The metal lantern on top was replaced in 1963 and is fitted with distinctive green-tinted glass, while the light was electrified in 1950 — before that, it had to be tended by hand. The lighthouse is still active today, warning boats of the shoals that guard the harbour entrance.

At the landward start of the breakwater stands the former lighthouse keeper's house, built at the same time as the tower. It has an unusual horseshoe shape, echoing the outline of an old coastal defence battery that once stood on the same spot. Walking the full length of the breakwater is the best way to appreciate its scale: the open Atlantic pounds one side, while the calm harbour and the old town of Le Croisic, with its rows of shipowners' houses, sit quietly on the other.

When should you visit?

Early evening offers the best light for photographs, as the sun sets over the ocean and washes the tower in gold — this stretch of the Loire-Atlantique coast is known for long, warm sunsets. Spring and autumn are quieter seasons for walking the breakwater, away from the summer crowds, though winds tend to be stronger then. In summer, aim to visit outside the midday peak, when the beaches and harbour get busiest.

Frequently asked questions

Can you go inside the lighthouse? No, Phare du Tréhic is closed to visitors — it operates automatically and has no viewing platform inside the tower.

Is it safe to walk out to the lighthouse? Yes, as long as you check the sea conditions beforehand. In high wind or at high tide, waves can wash over the breakwater, so it's best to skip the walk that day.

How long does the walk to the end take? About 15–20 minutes each way at a relaxed pace, depending on where you start.

Are there other things to see nearby? Yes — Le Croisic's marina, the old town with its stone shipowners' houses, and the salt marshes (marais salants) further inland, a hallmark of this part of Brittany.