Carquefou (French pronunciation: [kaʁkəfu] ⓘ; Gallo: Carqefou, Breton: Kerc'hfaou) is a commune in the Loire-Atlantique, department in the region Pays de la Loire, in western France.

The headquarters of the geophysical research company Sercel is located in Carquefou[5][6] In 2008, the local football team Union Sportive Jeanne d'Arc Carquefou reached the quarter-finals of the French Cup after a win over the 8-times national champions Olympique de Marseille on 19 March, putting the town in the national headlines.

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