The Rance (; , ) is a river of northwestern France. It is long. The semi-tidal river flows into the

English Channel The English Channel, also known as the Channel, is an arm of the Atlantic Ocean that separates Southern England from northern France. It links to the southern part of the North Sea by the Strait of Dover at its northeastern end. It is the busi ...

between Dinard and

Saint-Malo Saint-Malo (, , ; Gallo language, Gallo: ; ) is a historic French port in Ille-et-Vilaine, Brittany (administrative region), Brittany. The Fortification, walled city on the English Channel coast had a long history of piracy, earning much wealth ...

. 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 The Vilaine (; ) is a river in Brittany, in the west of France. The river's source is in the Mayenne ''Département in France, département'' (53), and it flows out into the Atlantic Ocean at Pénestin in the Morbihan ''département'' (56). It is ...

by means of the Canal d'Ille-et-Rance. '' Départements'' and towns along the river: *

Côtes-d'Armor The Côtes-d'Armor ( , ; ; , ), formerly known as Côtes-du-Nord until 1990 (, ), is a department in the north of Brittany, in northwestern France. In 2019, it had a population of 600,582.Collinée, Caulnes,

Dinan Dinan (; ) is a walled Brittany, Breton town and a commune in France, commune in the Côtes-d'Armor Departments of France, department in northwestern France. On 1 January 2018, the former commune of Léhon was merged into Dinan. Geography Inst ...

Ille-et-Vilaine Ille-et-Vilaine (; Gallo language, Gallo: ''Ill-e-Vilaenn'', ) is a departments of France, department of France, located in the regions of France, region of Brittany (administrative region), Brittany in the northwest of the country. It is named a ...

: Dinard,

Hydrology and water quality

Tributaries A tributary, or an ''affluent'', is a stream or river that flows into a larger stream ('' main stem'' or ''"parent"''), river, or a lake. A tributary does not flow directly into a sea or ocean. Tributaries, and the main stem river into which the ...

of the Rance include: * Croqueloir * Clergé * Fremeur * Quinéford This river has moderate

turbidity Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of both water clarity and wa ...

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

and

electrical conductivity Electrical resistivity (also called volume resistivity or specific electrical resistance) is a fundamental specific property of a material that measures its electrical resistance or how strongly it resists electric current. A low resistivity in ...

of the waters have tested at 33 micro-siemens per centimetre. At this reference location, summer flows are typically in the range of .

References

Rivers of France Rivers of Côtes-d'Armor Rivers of Ille-et-Vilaine Rivers of Brittany 2Rance {{France-river-stub