A river of North France; rises in the department of Aisne, near St. Quentin, and flows 150 m. SW. and NW. to the English Channel; navigable as far as Abbeville. 2, A department of North France, fronting the English Channel, between Seine-Inférieure (S.) and Pas-de-Calais (N.); one of the most prosperous agricultural and manufacturing districts of France; Amiens is the chief town.