The five departements are called `` historical Brittany '' . In 1956 , French Regions were created by gathering Departements between them . The Region of Brittany comprises , since then , four of the five Breton dÃ partements ( 80 % of historical Brittany ) , while the remaining area of the old Brittany , the Loire-Atlantique dÃ partement around Nantes forms part of the Pays de la Loire region .