The river of the Bresle, which runs between Mers-les-Bains and le Tréport, marks the boundary between Normandy and Picardy. However, the boundary takes a loop to include Eu in Normandy. The Emperor Napoleon III used to have a summer palace in Eu, even inviting Queen Victoria to stay.

I once met the Mayor of Eu, who said, 'Please call me Monsieur le Maire de la ville d'Eu, I don't like being thought of as Le Maire d'Eu.' There are surprisingly few rude words in French, but the latter title sounds exactly like one of them.