Orne (river)

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The Orne (French: [ɔʁn] (About this soundlisten)) 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.

Orne in Caen.jpg
The Orne in Caen
Physical characteristics
 • locationAunou-sur-Orne
 • elevation240 m (790 ft)
 • location
English Channel
 • coordinates
49°16′42″N 0°13′34″W / 49.27833°N 0.22611°W / 49.27833; -0.22611 (English Channel-Orne)Coordinates: 49°16′42″N 0°13′34″W / 49.27833°N 0.22611°W / 49.27833; -0.22611 (English Channel-Orne)
Length170 km (110 mi)
Basin size2,932 km2 (1,132 sq mi)
 • average27.5 m3/s (970 cu ft/s)

The Orne flows through the following departments and towns:


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 qualityEdit

The waters of the Orne are typically moderately turbid and brown in colour. pH levels of the Orne have been measured at 8.5[3] at the town of St. Andre sur Orne where summer water temperatures approximate 18 degrees Celsius. Electrical conductivity of the Orne has been measured at 30 micro-Siemens per centimeter.

See alsoEdit


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