France is divided into 18 regions:
13 – régions métropolitaines – regions located in Metropolis – the mainland of France;
5 – régions ultramarines – regions belonging to the overseas territories, officially they are called les départemens et régiones d’outre-mer or DROM.
Below is a list of regions with their central city in brackets.
Mainland France

Auvergne-Rhone-Alpes (Lyon)
Bourgogne-Franche-Comte (Dijon)
Bretagne (Rennes)
Center-Val de Loire (Orléans)
Corse (Ajaccio)
Grand Est (Strasbourg)
Hauts-de-France (Lille)
Île-de-France (Paris)
Normandie (Rouen)
Nouvelle-Aquitaine (Bordeaux)
Occitanie (Toulouse)
Pays de la Loire (Nantes)
Provence-Alpes-Côte d’Azur (Marseille)
Overseas regions of France

Guadeloupe (Basse-Terre)
Martinique (Fort-de-France)
Guyane (Gayenne)
La Réunion (Saint-Denis)
Mayotte (Mamoudzou)