Étang de Thau, Lagoon in Sète, France
Étang de Thau is a lagoon of about 7,500 hectares, roughly 21 km long and 8 km wide, separated from the Gulf of Lion by a sand bar running from the Agde volcano to Mont Saint-Clair in Sète. Its mean depth is 4.5 m, but the Fosse de la Vise near Bouzigues drops to 30 m and feeds the Balaruc spa. Two graus at Marseillan and two canals at Sète link it to the Mediterranean.
Ancient Greeks and Romans used the lagoon for salt extraction and maritime commerce along key trade routes. The opening of the Canal du Midi centuries later further integrated it into transportation networks and strengthened its role in regional commerce.
Oyster and mussel farming shapes daily life along these shores, connecting the local community to traditions passed down through generations. You can watch the cultivators work and see how central this practice is to the identity of the region.
You can visit fishing villages on the northern shores to watch cultivators at work and find fresh seafood restaurants. The water varies seasonally, so check local conditions before planning activities like swimming or boating.
The lagoon holds a 30-metre-deep depression near Bouzigues, the Fosse de la Vise, whose hot spring feeds the spa at Balaruc-les-Bains. Its bed also shelters spotted seahorses and the critically endangered great pen shell, one of the last refuges for a species once behind the sea silk linked to the Golden Fleece.
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