Blanche (Loire-Atlantique)

The Blanche is a tributary of the left bank of the Acheneau and thus a sub-tributary of the Loire.

A small watercourse flowing between a building to the left and a fenced road to the right, bordered by vegetation and with trees on the skyline.
La Blanche river at the end of summer in Chéméré.
Blanche (Loire-Atlantique) is located in France
Blanche (Loire-Atlantique)
Blanche (Loire-Atlantique) is located in Pays de la Loire
Blanche (Loire-Atlantique)
Native nameLa Blanche (French)
Location
CountryFrance
DepartmentLoire-Atlantique
ArrondissementNantes
Physical characteristics
Source 
  locationChaumes-en-Retz
  coordinates47.1179°N 1.9297°W / 47.1179; -1.9297
  elevation11,36
MouthAcheneau
  location
Cheix-en-Retz
  coordinates
47.1791°N 1.8301°W / 47.1791; -1.8301
  elevation
0m
Length16.7 km (10.4 mi)[1]
Basin features
ProgressionAcheneauLoireAtlantic Ocean
Tributaries 
  rightRuisseau du Bois Beaulieu

Etymology

The name, Blanche, meaning white in French, is thought to derive from the presence of white chalk in the water from the lime kilns around Arthon-en-Retz. Another hypothesis is that the name derives from the white mist over its related marshland.[2]

Geography

La Blanche is located entirely in the Pays de Retz, south of the Loire in the department of Loire-Atlantique. It covers the municipalities of Chaumes-en-Retz ( Arthon-en-Retz and Chéméré), Saint-Hilaire-de-Chaléons, Cheix-en-Retz and Rouans.[1]

Hydrography

The Blanche basin is bordered by the Acheneau basins to the north, the Tenu to the east, the Falleron to the south and the Canal de Haute Perche to the west. It has its source in the east of Chaumes-en-Retz and it flows eastward, fed from the north by streams from the Forêt de Princé and from the south from around Saint-Hilaire-de-Chaléons. After about 7km the river veers north and continues for 9km, fed by several streams from the west and east including the Ruisseau du Bois de Beaulieu at Pont Beranger. Its confluence with the Acheneau is in the marshes of the Marais de Cheix south of Cheix-en-Retz where it divides into two, the Vielle Blanche joining the Acheneau to Buzon while the Blanche continues to the west more channelled in a network of canals, joining the Acheneau further south-west of the town in the Marais d'Acheneau.

La Blanche to the south and east of the Forest of Princé on the Cassini Map (17th century)

References

  1. Sandre. "Fiche cours d'eau - La Blanche (M8305400)". Retrieved 25 May 2022.
  2. "La Blanche" (in French). Office de tourisme intercommunal de Pornic. Retrieved 25 May 2022.
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