From the port of Pointe-de-Grave travel 4.7 miles (8 km), by boat to the Cordouan Lighthouse, the oldest lighthouse in France. It stands majestically at the entrance of the Gironde estuary. Nicknamed the "Versailles" of the sea, it is one of the famous monuments of the region.
After a pleasant boat trip, you will land on the Cordovan causeway and visit the lighthouse, during which the lighthouse keepers welcome you for a fascinating guided tour.
On landing at Cordovan you will find that the water is sometimes knee deep. So suitable shoes are essential! Flip flops should be avoided. 
*They disclaim any responsibility for the wet or damaged items or clothes.