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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.
The Seine River. The Seine River is 480 miles long and is the biggest river in France in terms of popularity and name recognition. It begins in the Alps and flows north and west through Troyes, Paris and Normandy, ending in the English Channel.