Does anyone know the name of this place in France?

When I was in high school my french teacher had a poster of this beautiful city in France. It was walled and surrounded by water. Sometimes the water level would drop and it looked kind of like a sandy marsh surrounding it. She told me the name of the place once but I forgot. Does anyone know what I'm talking... show more When I was in high school my french teacher had a poster of this beautiful city in France. It was walled and surrounded by water. Sometimes the water level would drop and it looked kind of like a sandy marsh surrounding it. She told me the name of the place once but I forgot. Does anyone know what I'm talking about?
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