Rance (river)

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File:Dinan port.jpg
The Rance in Dinan.
Origin Brittany
Mouth English Channel
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Basin countries France
Length 102 km
Avg. discharge 12 m³/s
Basin area 1,195 km²

The Rance is a river of northwestern France.[1] It flows into the English Channel between Dinard and Saint-Malo.

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:

Hydrology and water quality

Tributaries of the Rance include:

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 500 cubic feet per second (14 m3/s).


  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, Scotland(2006)