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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.
(sÄn, sÄn) 1  A river of northern France flowing about 770 km (480 mi) generally northwest to the Bay of the Seine, an inlet of the English Channel, near Le Havre. It has been an important commercial waterway since Roman times and has figured significantly in the histories of Paris, Rouen, and Le Havre.