Orne (river)

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Orne in Caen.jpg
The Orne in Caen
Origin Aunou-sur-Orne
Mouth English Channel
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Basin countries France
Length 170 km (110 mi)
Source elevation 240 m (790 ft)
Avg. discharge 27.5 m3/s (970 cu ft/s) at mouth
Basin area 2,932 km2 (1,132 sq mi)

The Orne (Ptolemeus Olina[citation needed]) is a river in Normandy, within northwestern France.[1] It discharges into the English Channel at the port of Ouistreham. Its source is in Aunou-sur-Orne, east of Sées. The Odon is one of its tributaries.

The Orne flows through the following departments and towns:


The name of the Orne river in Normandy, which is referred to as the Olina by Ptolemy, 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. pH levels of the Orne have been measured at 8.5[2] 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 also


  1. Atlas des Routes de France, Solar Press: Donnees IGN (2007)
  2. Hogan, C Michael, Water quality of freshwater bodies in France, Lumina Press, Aberdeen 2006