The canton of Guémené-Penfao is an administrative division of the Loire-Atlantique department, western France. Its borders were modified at the French canton reorganisation which came into effect in March 2015. Its seat is in Guémené-Penfao. It consists of the following communes: Abbaretz La Chevallerais Conquereuil Derval La Grigonnais Guémené-Penfao Jans Lusanger Marsac-sur-Don Massérac Mouais Nozay Pierric Puceul Saffré Saint-Vincent-des-Landes Sion-les-Mines Treffieux Vay References Cantons of Loire-Atlantique