Orne (river)

For the river Orne in Lorraine, see Orne (Moselle).

Orne
The Orne in Caen
Origin	Aunou-sur-Orne
Mouth	English Channel 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)
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 formed the Eastern flank of the Allied landings in Normandy during World War II on 6 June 1944.

The Orne flows through the following departments and towns:

• Orne (named after the river): Sées, Argentan
• Calvados: Thury-Harcourt, Caen, Ouistreham

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

• St. Andre sur Orne
• Canal de Caen à la Mer

Notes

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

• The Orne at the Sandre database