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For other uses, see Seine (disambiguation). The Seine (/seÉªn/ SAYN; French: La Seine, pronounced: [la sÉËn]) is a 777-kilometre-long (483 mi) river and an important commercial waterway within the Paris Basin in the north of France.
1. La Seine. begins near Dijon and flows through. Paris. to Normandy and empties into. the English Channel; the most important river in terms of commercial transportation and the most easily navigable of. Franceâs major rivers. 2.