MotreffMotreff is a commune in the Finistère department of Brittany in north-western France.WWW Official SiteGeographyHistorically, Motreff belongs to Cornouaille. The village lies on the northern slope of the Montagnes Noires. The village centre is located south of Carhaix-Plouguer.PopulationInhabitants of Motreff are called in French Motreffois.