A Visit to the La Cayenne Claires

What it is

The claires are the clay ponds in the Marennes marsh where oysters spend their last weeks before being sold: the shallow, algae-rich water gives them their flavour and, sometimes, the green colour for which the fines de claire are known. Seeing them from the inside, with a producer explaining the trade, is the best way to understand what you will then eat in the cabins.

On the La Cayenne canal, in Marennes, the former Cité de l'Huître closed in November 2025. In its place, on the same rue des Martyrs, two producers' visits share the year: Marenn'Ostra in summer and Le Banc d'Aline, at the Cabane des Claires, in autumn.

What the visit includes

Both follow a similar scheme: the oyster's journey from birth to plate, a walk beside the claires and the canal and the working cabin from the inside. They end with direct sales and, if you choose it, a tasting.

At Le Banc d'Aline the visit lasts 30 to 45 minutes without tasting, and one to one and a half hours with it. The tasting is a choice between six oysters with bread, butter and a glass of white wine (or a soft drink), or seafood rillettes with toasts and the same glass. It is held in French.

When

• Marenn'Ostra: in 2026, from July to September, on Tuesdays, Wednesdays, Thursdays, Fridays and Sundays, 10:30 to 12:30 and 14:30 to 16:30, according to the tourist office listing. The season's closing dates differ between sources (27 or 30 September).
• Le Banc d'Aline: from 1 October to 13 November 2026, Tuesday to Friday, 10:30 to 12:00 and 14:30 to 16:00.

The 2027 dates have not yet been published. Check with the Oléron and Marennes tourist office before planning the trip; if you go in spring, neither is announced.

Price and booking

Le Banc d'Aline charges €7 to €11 per person, adults and children, depending on whether you take the tasting. Booking is compulsory: you do it on the visit's listing on the tourist office website (ile-oleron-marennes.com), at its offices or by phone with the cabin, on +33 5 46 47 93 43. For Marenn'Ostra we have not been able to verify the 2026 price: buy the ticket through the tourist office before going.

Getting there

The meeting point is rue des Martyrs, on the La Cayenne canal, in Marennes-Hiers-Brouage, a few minutes from the centre of Marennes. Parking is free. By bike you get there from Marennes along the basin's tracks, and the Vélodyssée passes through Marennes.

Where to eat afterwards

On the same street, at the canal's edge, La Cabane aux Marées serves oysters from local producers on its terrace, from April to November and Wednesday to Sunday. If you are sleeping in Marennes, the ibis Styles Marennes Oléron is a few minutes away.

With children

The short visit, without tasting, works with children once they can listen for half an hour, although the explanation is in French. For a plan designed more for them, on the island there is Fort-Royer, with treasure hunts and workshops. It is windy in the marsh and there is little shade: a jacket in autumn, a cap in summer.