At the exact point where the Gironde River flows into the Atlantic Ocean, a stone ship dropped anchor at the end of the 16th century. In the night and fog, it shines and guides sailors between currents and sandbanks. Cordouan is the oldest lighthouse in France still in operation. It was one of its keepers, Benoît Jenouvrier, who compared it to a stone boat. Alternating with five other colleagues, he ensures a permanent presence. Since automation, no lighthouse in France is inhabited. But Cordouan, a historic monument, is in a class of its own. Benoît shows us around.