La Fosse

20.3°C Water temp · Sep 11

France Coastal 3 - Sufficient 20.3°C

Satellite image of LA FOSSE — Satellite image © Esri

La Fosse is a bathing beach located in Saint-Cast-le-Guildo in Brittany, France. The beach is situated in a coastal area characterized by tidal bays and Atlantic influences. The water quality profile has been revised to assess potential pollution sources and implement management measures for safe swimming.

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Water

Coastal bathing area in the Fresnaye bay. The zone experiences significant tidal ranges and is influenced by Atlantic tidal currents. Marine water body subject to tidal dynamics and coastal hydrodynamics.

Location

Saint-Cast-le-Guildo, department of Côtes-d'Armor (22), Brittany, France. The beach is part of a commune with multiple bathing sites and is located near the Fresnaye bay.

Water Quality

The beach has been classified since 2020. Water quality monitoring includes bacteriological analysis and E. coli measurements. Potential pollution sources have been identified including rainfall runoff, natural watercourse discharge, and the Matignon wastewater treatment system. Shellfish production zones are monitored in the adjacent Fresnaye and Arguenon bays.

Risks

Green algae (ulva) accumulation and putrefaction zones occur in the Fresnaye bay. Natural watercourse discharge, particularly from the Fremur, Rat, Matignon, and Kermiton rivers, can elevate E. coli levels. Rainfall events influence bathing water quality. Risk of macroalgae and phytoplankton proliferation in the bay.