La Mare

16.5°C Water temp · Jun 8

France Coastal 1 - Excellent 16.5°C

Satellite image of LA MARE — Satellite image © Esri

Mare Beach is located in Saint-Cast le Guildo, a commune in the Côtes d'Armor department of Brittany, France. The beach faces the Fresnaye Bay, positioned between Saint-Brieuc Bay to the west and Arguenon Bay to the east. The bathing profile documents the beach's physical characteristics and identifies sources of microbiological contamination that could affect water quality and swimmer health. The document establishes management measures and an action plan to preserve water quality at the beach.

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Water

The bathing water faces Fresnaye Bay, a small coastal depression in the English Channel. Tidal range is 10.55 metres during spring tides and 5 metres during neap tides. Current velocities near the coast are generally less than 0.2 m/s. Dominant waves during summer are northwest-facing with 83% having significant height below 1 metre and 98% below 2 metres.

Location

Saint-Cast le Guildo is located in Brittany, Côtes d'Armor department, approximately 49 km from Saint-Brieuc and 32 km from Dinan. The beach faces Fresnaye Bay and is bordered by Matignon to the west, Saint-Pôtan to the southwest, Saint-Lormel to the north, and Créhen to the northeast.

Season

Profile references bathing season 2010 but does not specify official monitoring or swimming season dates.

Water Quality

The profile includes assessment of bacteriological quality of bathing waters, potential for macroalgae proliferation, and potential for phytoplankton proliferation. Multiple pollution sources are evaluated including rainwater drainage, collective sewage systems, non-collective sanitation, and agricultural activities.

Risks

Potential pollution sources identified include rainwater drainage systems, collective sewage systems, non-collective sanitation systems, and agricultural runoff. The area has rapid hydrological response to rainfall variation with minimal buffering capacity.