Thau Swim Trek 2026

The Thau Swim Trek 2026, scheduled from May 14th to May 16th, offers a multi-stage open water experience within the Étang de Thau. Swimmers can participate in distances ranging from 2km to 10km, with stages connecting key ports along the lagoon including Marseillan, Mèze, Bouzigues, Balaruc, and the final arrival in Sète. Registration fees are progressive, rewarding early entry to this technical challenge across a protected saltwater environment.

The singular environment

Swimming across this lagoon reveals why it is locally termed 'l'île singulière'. As you navigate between stages, you may spot the Greater Flamingo, a common resident of these wetlands, or catch a glimpse of the Mont Saint-Clair lighthouse guiding your path from the shore. The route takes you past the slopes where the Marine Cemetery sits, a site that famously inspired Paul Valéry’s poetry. The area’s history is etched into its name; derived from the Greek 'kêtos' for whale, the city maintains this legacy in its coat of arms, a detail that feels particularly apt when navigating the open expanse of the lagoon.

Historical context

While you focus on your stroke, notice the canals of Sète, which host the traditional Saint Louis water jousting competitions that have occurred annually since 1703. The water here also bears witness to more somber history, including the 1947 departure of the SS President Warfield, later known as the SS Exodus. The course navigates near the protected seagrass meadows of the Natura 2000 network and the Lido de Thau coastal strip. For those looking for more time in these waters, the 55th Sète Fin Swimming Crossing takes place in late April, while the 105th Sète Crossing offers another opportunity in late August.