Orne (river)

The Orne (French: [ɔʁn] ⓘ) is a river in Normandy, within northwestern France. It is 170 km (110 mi) long.[1] It discharges into the English Channel at the port of Ouistreham. Its source is in Aunou-sur-Orne, east of Sées. Its main tributaries are the Odon and the Rouvre.

For the river Orne in Lorraine, see Orne (Moselle).
Orne
The Orne in Caen
Orne (river) is located in France
Orne (river)
Orne (river) is located in Normandy
Orne (river)
Location
CountryFrance
Physical characteristics
Source 
 • locationAunou-sur-Orne
 • elevation240 m (790 ft)
Mouth 
 • location
English Channel
 • coordinates
49°16′42″N 0°13′34″W
Length170 km (110 mi)
Basin size2,932 km2 (1,132 sq mi)
Discharge 
 • average27.5 m3/s (970 cu ft/s)

Geography

The Orne flows through the following departments and towns:

Its longest tributaries are, from source to mouth:[1]

Name

The name of the Orne in Normandy, which is referred to as the Olinas by Ptolemy,[2] is a homonym of Fluvius Olne, the Orne saosnoise in Sarthe, which Xavier Delamarre traces back to the Celtic olīnā (elbow).

Hydrology and water quality

The waters of the Orne are typically moderately turbid and brown in colour. Its pH level has been measured at 8.5[3] at the town of St. 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.

See also

References
  1. Sandre. "Fiche cours d'eau - L'Orne (I2--0200)".
  2. Public Domain Smith, William, ed. (1857). "Olinas". Dictionary of Greek and Roman Geography. Vol. 2. London: John Murray. p. 473–474.
  3. Hogan, C Michael, Water quality of freshwater bodies in France, Lumina Press, Aberdeen 2006.


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