| Sienne | |
|---|---|
 Sienne estuary near Regnéville-sur-Mer | |
   | |
| Location | |
| Country | France |
| Physical characteristics | |
| Mouth | English Channel |
• coordinates | 49°00′22″N 1°34′05″W / 49.0061°N 1.5681°W |
| Length | 92.6 km (57.5 mi) |
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. It flows into the English Channel near Regnéville-sur-Mer.[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.