Describes La Grande Fourche as an approachable site protected from ebb tide.
Les fourches: kelp-and-sand dive by Grande Fourche.
Les fourches: kelp-and-sand dive by Grande Fourche.
Les fourches is a compact Brittany coast dive at the base of the Grande Fourche rock, where a kelp plateau fades into sand and scattered boulders. The route is short and terrain-driven rather than long and deep, so it suits calm-window exploration with a slow look along the kelp line and rock faces for small marine life.
Conservative baseline from public research. No community dives logged yet.
Depth range, seasonality, and planning context.
Reported Depth
0m - 20m
Depth Note
The site is reported around the surface to about 20 m, with the main interest on the shallow kelp plateau and the rock/sand edge.
Best Season
Late spring through early autumn, with the calmest weather windows preferred.
Typical Conditions
Temperate kelp and rock over sand, with cooler Atlantic water and variable clarity. The site is best when swell is low and the surface stays settled.
Site conditions, restrictions, and access requirements.
Site Conditions
Safety Notes
Choose calm sea-state windows, watch the rock edge for swell wrap, and keep the exit plan simple if the water builds during the dive.
Access Restrictions
No special site restriction was confirmed in the reviewed sources; plan around local landing, parking, and marine notices before entering the water.
Legal Notes
Follow local marine, navigation, and landing rules; check for any temporary access or anchoring limits before the dive.
Community notes to help plan your visit.
Scuba Diving
A shallow dive (0–20 m) following the kelp edge down toward sandy terrain with scattered rocks.
Freediving
Possible only for experienced freedivers in very calm conditions. Treat it as a secondary option rather than the main use case.
Snorkeling
The shallow kelp and sand fringe can work for snorkel sessions when the sea is calm, but this is still a coastal site with changing surface conditions.
Species commonly reported at this site, with direct links into their wildlife guides.
Community dive logs and visit reports for this site.
Average conditions based on logged dives & visits.
Planning answers for access, conditions, timing, and site logistics.
Last Updated
Research Sources
Describes La Grande Fourche as an approachable site protected from ebb tide.
Trézien lighthouse and the Chenal du Four context place the site in an active coastal navigation area.
Porsman waters are sheltered between Ile Segal and the Roches des Fourches.
Trézien spot page with the assigned coordinates and the base-of-rock location framing.
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