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A river rising in the Ardennes Mountains of southern Belgium and flowing about 300 km (185 mi) generally southwest to the Seine River in northern France. It is an important commercial waterway.
1. (Placename) a department of N France, in Picardy region. Capital: Beauvais. Pop: 776 999 (2003 est). Area: 5887 sq km (2296 sq miles)
2. (Placename) a river in N France, rising in Belgium, in the Ardennes, and flowing southwest to join the Seine at Conflans. Length: 302 km (188 miles)
a river in W Europe, flowing SW from S Belgium through N France to the Seine, near Paris. 186 mi. (300 km) long.