Île-de-France, région of France encompassing the north-central départements of Val-d’Oise, Seine-et-Marne, Seine-Saint-Denis, Ville-de-Paris, Hauts-de-Seine, Val-de-Marne, Essonne, and Yvelines. Île-de-France is bounded by the régions of Hauts-de-France to the north, Grand Es...