Les Onglous lighthouse

Les Onglous Lighthouse marks the point in Marseillan Plage where the Canal du Midi finally reaches the sea, or rather, the lagoon. Standing at the tip of a short east jetty in the Hérault department, this small red-and-white lighthouse is the traditional endpoint of one of France's most famous waterways, where the man-made canal opens into the wide, brackish waters of the Étang de Thau.

Where exactly is the lighthouse?

The lighthouse sits about 1.5 km south of Marseillan, on a narrow strip of land known as the Isthmus of Onglous. This isthmus is what separates the Étang de Thau from the Mediterranean Sea — a detail that makes the spot feel like a natural hinge point, with calm lagoon water on one side and open sea on the other, and the jetty running out between them straight to the lighthouse.

How do you get there?

The easiest approach is on foot or by bike from Marseillan Plage: the seafront promenade and the paths running alongside the canal lead almost right up to the jetty. Visitors based in Marseillan itself, a short ride away, can follow the towpath along the Canal du Midi, watching fishing boats and pleasure craft head out toward the Étang de Thau along the way. The terrain is flat the whole way, which makes it an easy walk or ride for families, casual cyclists, and anyone pushing a stroller.

What will you actually see?

Don't expect a towering monument — this is a modest navigational marker, not a grand structure. Its appeal is really about context rather than scale. It stands at the symbolic end (or start, depending which direction you're traveling) of the Canal du Midi, the historic waterway that links the Atlantic to the Mediterranean through a chain of canals and lagoons across southern France. From the jetty, you can watch boats moving between the canal and the open lagoon, look across the Étang de Thau at the oyster and mussel farming platforms dotted along the water, and pick out the outlines of Marseillan and Marseillan Plage in the distance. It's a favorite spot for photographers, since the red-and-white tower set against the blue of the lagoon and sky makes for a clean, striking shot.

When is the best time to visit?

Early morning and late afternoon light works best for photos, and in the warmer months it's worth timing a visit for the hour or two before sunset, when the jetty is noticeably quieter than during the busy midday hours around the beaches and promenade of Marseillan Plage. Because the site sits fully exposed between the lagoon and the sea, it can get windy even in summer, so it's worth bringing something to cut the breeze regardless of the season.

Frequently asked questions

Can you go inside Les Onglous Lighthouse? No — it's a small working navigation marker at the end of the jetty, meant to be viewed from outside as you walk or cycle along the waterfront, not entered.

How far is the lighthouse from central Marseillan? Roughly 1.5 kilometers to the south along the coast and canal path, which typically takes 20 to 30 minutes on foot depending on your pace.

What is the Isthmus of Onglous? It's the narrow strip of land the lighthouse stands on, separating the Étang de Thau lagoon from the Mediterranean Sea, right at the point where the Canal du Midi ends its course and opens into the lagoon.

Is it worth combining with other things to see nearby? Yes — the beaches and promenade of Marseillan Plage and the harbor and old town of Marseillan are both close by, so the lighthouse fits naturally into a longer walk or bike ride around the area.