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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 port of Le Havre at the mouth of the Seine is Franceâs largest international shipping port, and the river runs through the wealthiest and most populated of the twenty-seven administrative regions of France, known as Ãle-Ã®le-De france or The Paris. regionth to 11th Centuries. During the 9 th century, the Vikings pillaged the Upper Seine, destroying much of Rouen, and sailed the river south to attack Paris, laying siege to the city for a year to no avail.