Merlinxx has it; it's Le Touquet; the pic is a postcard I sent in 1967 after an involuntary and totally unqualified night landing there, resulting from awful flight planning. They gave me an SRA (or similar) with enormous charm and encouragement. "Rien de quoi, Monsieur", they said afterwards.
I thought that "baffling" would be a clue!
Merlinxx has control.