Wade or walk across the tidal flats to Fort National — Vauban's magnificent 17th-century island fortress, accessible only at low tide — for a guided exploration of the most dramatic military citadel on the Breton coast.
What to expect
When the tide retreats, a sandy causeway emerges linking Saint-Malo beach to this extraordinary granite fortress — a crossing that feels genuinely adventurous. Inside, your guide narrates the fort's role as a privateer prison and coastal defence, with the full panorama of the walled city, the bay, and the open Atlantic as your backdrop. The views from the upper bastions are among the finest in all of Brittany — and because access windows are brief, the experience always feels singular and unhurried.
Good to know
Tide times are published on the Fort National website — check before your port day and plan your timing carefully. The walk across takes around 10 minutes from the beach at Bon Secours. Fort National is a 15-minute walk from the cruise terminal along the seafront. Open seasonally (generally April–October); confirm opening dates at fortnational.com.
Sail there
Luxury cruises that call at St. Malo — book through us, the fare is identical and your concierge stays on your side.