South of the château the bocage stops and the land goes flat: the Marais du Cotentin et du Bessin, thirty thousand hectares of wet meadows, reed beds and slow rivers between Carentan and the Bay of the Veys, one of France’s great wetlands and its regional nature park since 1991. In winter the rivers flood and the whole plain turns to a lake — the locals call it the blanchie, the whitening — and in spring it dries into hay meadows full of storks and herons. It is not a landscape you can see from a car. You see it from a boat, and the Bateliers des Marais at Carentan run the boats.
The guided cruise
The Rosée du Soleil is a seventy-seat passenger boat with an open stern deck, a ramp and toilets on board, that sails up the Taute from its jetty at Saint-Hilaire-Petitville, on the edge of Carentan — 35 minutes from the château. The skipper’s commentary is the point: the fauna, the old marsh trades, the paratroopers who dropped into these flooded fields on the night of 5 June 1944, the Graignes memorial where the boat turns, and a stop at the Maison des Ormes, an old lock-keeper’s house on the Vire–Taute canal. An hour and a half to an hour and three-quarters, departures at 10 am, 2:30 pm and 4:30 pm according to the season’s timetable, €20 for adults and €15 for children of four to twelve; a longer version adds a country lunch at the Maison des Ormes (€39 / €20). Booking is compulsory and done online. Dogs are welcome on all the boats. Directions to the Taute jetty.
Boats you drive yourself
The other way to do it is slower and quieter: electric boats with no licence needed, rented by the hour from the Port Jourdan jetty at Saint-Côme-du-Mont, next to the Maison du Parc, 30 minutes from the château. A five-seater is €44 for an hour and €74 for two; a nine-seater with a roof and a folding picnic table €60, €100 and €125 for one, two and three hours; there is a three-hour picnic formula with a place to moor. Lifejackets are provided and compulsory for children under twelve. Open from April to the end of September — Wednesday to Sunday in spring and September, every day in July and August; booking strongly advised, +33 6 83 60 08 12. Guided small-boat trips with a batelier (maximum twelve people, from €25) also leave from here. Directions to Port Jourdan.
The Maison du Parc and the winter
The boats stop in early October, but the marsh does not. The Maison du Parc at Saint-Côme-du-Mont is the nature park’s visitor centre — exhibition, shop, picnic area, bike hire — and the gateway to the Ponts d’Ouve reserve: a one-kilometre trail to a bird hide, open all year, and a 5.5-km loop with three more hides from mid-May to October. Entry €5, free under 25, and free in the winter months when only the trail is open. That is when to come for the blanchie, between December and February: hundreds of ducks and waders on what was a meadow in June. The Maison keeps shorter hours out of season (Wednesday to Sunday) and closes from mid-December to early January; check before you drive.
With the rest of the day
Carentan is on the way to Utah Beach and the Sainte-Mère-Église side of the D-Day story, so a morning on the water and an afternoon on the beaches is the natural pairing. For a wet day with children, the guided cruise is the one activity in the Cotentin that is better in the rain — the boat is covered, and the marsh looks like itself.
Prices and times are the 2026 ones published by the operators; last checked 7 October 2026, at the end of the season. The 2027 dates were not yet out.
Stay at the château
Make the château your base for this and everything else in the guide: four B&B rooms from €95 a night, four self-catering cottages from €100 a night, 35 minutes from the Cherbourg ferry. Best rate when you book direct.