a historical region of France, in the central part of the Paris basin, between the Seine, Marne, and Oise rivers. The territory of Ile-de-France, with its center in Paris, was the nucleus of the French state, which was formed at the end of the tenth century by the Capetian dynasty. Neighboring lands were gradually annexed to this nucleus. Ile-de-France was the central region of the revolutions of the late 18th century, 1830, 1848, and 1871. Ile-de-France was one of the principal centers of the French Resistance Movement during the fascist German occupation of France from 1940 to 1944.
The territory of Ile-de-France contains the departments of Paris, Yvelines, Essone, Hauts-de-Seine, Seine-Saint-Denis, Valde-Marne, Val-d’Oise, Oise, and part of the departments of Seine et Marne and of Aisne.