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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 third-longest river in France, the Seine emerges from the earth in a remote spot called Source-Seine, in the Burgundy wine region of northeastern France. The river flows northwesterly â curving through Paris â to the Normandy coast, where it empties into the English Channel.th 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.