The municipal arrondissement (French: arrondissement municipal [aʁɔ̃dismɑ̃ mynisipal]) is a subdivision of the commune, used in the three largest cities: Paris, Lyon and Marseille. It functions as an even lower administrative division, with its own mayor. Although usually referred to simply as "arrondissements", they should not be confused with departmental arrondissements, which are groupings of communes within one département.