The passage is named after oxen that were historically driven across the mudflats to graze on the island.
Île Madame, which the causeway leads to, covers only 0.78 square kilometers.
The passage is part of the 'Route de la Charente' and is subject to strict tidal safety regulations.
During low tide, the receding water exposes significant areas of mudflats rich in shellfish, making it a popular spot for local gleaning.
The site is historically significant as a place of detention for over 800 refractory priests during the French Revolution.
La Passe aux Bœufs is a 3.5-kilometer natural limestone causeway that connects the town of Port-des-Barques to the Île Madame. This maritime passage is submerged by the Atlantic Ocean during high tide, making it accessible only during low tide windows. The path provides a primary walking or driving route for residents and visitors to reach the island, which is the smallest of the four islands in the Charente estuary. The landscape is characterized by its flat, silty surface and salt marshes, offering unobstructed views of the Charente-Maritime coastline. It is a focal point for coastal activities including shore fishing, mud-walking, and traditional salt harvesting observation.
The mid-point of the causeway looking back toward the Port-des-Barques coastline during the first hour of low tide.
Always consult the official tidal schedule provided by the town of Port-des-Barques before attempting the crossing.
Wear water-resistant footwear with good grip, as the path remains slippery and muddy even when the tide is low.
Monitor the weather closely, as strong winds can accelerate the incoming tide faster than expected.
Attempting the crossing too close to the tide turn, as water levels rise rapidly across the flat terrain.
Access is completely dictated by the tide; the path is strictly closed and hazardous during high tide cycles.
Respect the fragile coastal ecosystem by staying on the marked path and avoiding disturbance to local wildlife and mudflat habitats.
