| Orne | |
|---|---|
 The Orne in Caen | |
   | |
| Location | |
| Country | France |
| Physical characteristics | |
| Source | |
| • location | Aunou-sur-Orne |
| • elevation | 240 m (790 ft) |
| Mouth | |
• location | English Channel |
• coordinates | 49°16′42″N0°13′34″W / 49.27833°N 0.22611°W /49.27833; -0.22611 |
| Length | 170 km (110 mi) |
| Basin size | 2,932 km2 (1,132 sq mi) |
| Discharge | |
| • average | 27.5 m3/s (970 cu ft/s) |
TheOrne (French:[ɔʁn]ⓘ) is ariver inNormandy, within northwesternFrance. It is 170 km (110 mi) long.[1] It discharges into theEnglish Channel at the port ofOuistreham. Its source is inAunou-sur-Orne, east ofSées. Its main tributaries are theOdon and theRouvre.
The Orne flows through the followingdepartments and towns:
It also flows through the areas known asSuisse Normande and thePlaine d'Argentan.[2][3]
Its longest tributaries are, from source to mouth:[1]
In 1960 a dam at Rabodanges inPutanges-le-Lac was built by along the course of the Orne.[4] The dam created a 6 km artificial lake covering almost 240 acres, making it the largest lake inLower Normandy.[5] The lake is now a popular tourist destination and had a designated swimming area opened in August 2022.[6]
The name of the Orne in Normandy, which is referred to as theOlinas byPtolemy,[7] is a homonym of Fluvius Olne, the Orne saosnoise in Sarthe, whichXavier Delamarre traces back to the Celtic olīnā (elbow).
The waters of the Orne are typically moderately turbid and brown in colour. ItspH level has been measured at 8.5[8] at the town ofSt. Andre sur Orne where summer water temperatures approximate 18 °C (64 °F). Electrical conductivity of the water has been measured at 30 microsiemens per centimeter.[citation needed]
Smith, William, ed. (1857). "Olinas".Dictionary of Greek and Roman Geography. Vol. 2. London: John Murray. p. 473–474.
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