Rance (river)

The Rance (French pronunciation: [ʁɑ̃s] ^ⓘ; Breton: Renk, [ˈrẽŋk]) is a river of northwestern France. It is 103.6 km (64.4 mi) long.^[1] The semi-tidal river flows into the English Channel between Dinard and Saint-Malo.

Rance
The Rance in Dinan
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Native name	ar Renk (Breton) la Rance (French)
Location
Country	France
Physical characteristics
Source
• location	Brittany
Mouth
• location	English Channel
• coordinates	48°38′28″N 2°2′26″W
Length	104 km (65 mi)
Basin size	1,195 km2 (461 sq mi)
Discharge
• average	12 m3/s (420 cu ft/s)

Before reaching the Channel, its waters are barred by a 750 metre long dam forming the Rance tidal power plant.

The river is linked to the Vilaine by means of the Canal d'Ille-et-Rance.

Départements and towns along the river:

• Côtes-d'Armor: Collinée, Caulnes, Dinan
• Ille-et-Vilaine: Dinard, Saint-Malo

Hydrology and water quality

Tributaries of the Rance include:

• Croqueloir
• Clergé
• Fremeur
• Quinéford

This river has moderate turbidity and its brownish water is somewhat low in velocity due to the slight gradient of the watercourse; pH levels have been measured at 8.13^[2] within the city of Dinan and electrical conductivity of the waters have tested at 33 micro-siemens per centimetre. At this reference location, summer flows are typically in the range of 14 cubic metres per second (500 cu ft/s).^{[citation needed]}