Les Quatre Vaux

16.5°C Water temp · Jun 8

France Coastal 3 - Sufficient 16.5°C

Satellite image of LES QUATRE VAUX — Satellite image © Esri

Plage des Quatre Vaulx is a bathing beach located in Saint Cast le Guildo in the Côtes-d'Armor department of Brittany, France. The beach is situated in the Arguenon bay area, which experiences significant tidal ranges. The beach profile has been revised as a Type 2 bathing water classification, indicating it requires detailed assessment of water quality and pollution sources.

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Water

Coastal marine bathing area in the Arguenon bay, which forms part of the Atlantic coastal waters. The bay experiences significant tidal variations with maximum tidal ranges in the Arguenon and Fresnaye bays.

Location

Saint Cast le Guildo, Côtes-d'Armor department (22), Brittany, France. The beach is located in the Arguenon bay.

Water Quality

Type 2 bathing water profile classification. Water quality monitoring includes bacterial analysis (E. coli and enterococci). Foot-fishing zones in the area have been classified according to microbiological standards. Monitoring data from upstream watercourses (Pont Quinteux stream, Arguenon river, and Guebriand stream) show E. coli concentration measurements.

Risks

Potential pollution sources include sewage system discharges, natural watercourse runoff, and diffuse pollution. The area is subject to green algae (ulve) proliferation, with documented beaching events recorded between 2002 and 2023. Putrefaction zones have been observed in the sector between 2008 and 2021.