The Rance (; , ) is a river of northwestern France. It is long. The semi-tidal river 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: 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 8.13Hogan, C. Michael, Water quality of freshwater bodies in France, Lumina Press, Aberdeen, Scotland(2006) 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 .
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