The Sienne (French pronunciation: [sjɛn]) is a 92.6 km (57.5 mi) long river in northwestern France located in the departments of Calvados and Manche, Normandy.

[1] Its longest tributaries are the Soulles and the Airou.

[1] The largest towns on the Sienne are Villedieu-les-Poêles and Quettreville-sur-Sienne.

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