Marne, river, c.325 mi (520 km) long, rising in the Langres plateau, NE France, and flowing in an arc generally NW to the Seine River near Paris. It passes through Chaumont and Châlons-en-Champagne. The Marne-Rhine Canal and the Marne-Saône Canal also connect with the Aisne, Meuse, Moselle, and Saar rivers. During World War I and World War II, the Marne region was the scene of much fighting, with especially heavy losses among the British forces.

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