ancient Sequana
Second longest river in France.
It rises on the Langres plateau, 18 mi (30 km) northwest of Dijon , and flows through Paris before emptying into the English Channel at Le Havre after a course of 485 mi (780 km). Its tributaries include the Marne and Oise rivers. It drains an area of about 30,400 sq mi (78,700 sq km) in northern France; its network carries most of France's inland waterway traffic.