CarquefouCarquefou is a commune in the Loire-Atlantique, department in the region Pays de la Loire, in western France.PopulationEconomyThe headquarters of the geophysical research company Sercel is located in Carquefou.SportIn 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.