Glénan Archipelago · France · Reef · Pinnacle
Les Bluiniers (Pic Jules Bonnot)
Witches' pots: holes drilled by pebbles in an old riverbed
Les Bluiniers, also known as Pic Jules Bonnot, is a rocky highland in the west of the Glénan archipelago lying between 20 and 40 m. Its rock is pitted with witches' pots, cylindrical holes worn by turning pebbles in the days when the Odet river flowed across this ground, and it is a deep site for experienced divers.
Also known as Les Bluiniers, Pic Jules Bonnot.
Where it is and how deep
47.7231° N, 4.0636° WApproximate position — the dashed circle shows where the site lies; your operator's briefing has the mooring.
The dive
The top of the highland lies at 20 m and the rock falls away to 40 m, so the dive begins deep. The witches' pots are the feature to find: holes of 1 to 3 m with smooth, curved walls, where crabs and spider crabs that fall in cannot climb back out. The surrounding rock carries congers, nudibranchs, Bonelli worms, jewel anemones and Axinella sponges.
Marine life and season
- Nudibranchs
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Fair | Fair | Fair | Good | Good | Good | Good | Good | Good | Good | Fair | Fair |
Season follows Glénan Archipelago: The island dive base on Saint-Nicolas opens from April to October; no peak month is marked within that season.
Sources
- Glénan International Diving Center — Enez Green
- OpenStreetMap — OpenStreetMap
- CIP Glénan infos utiles — CIP Glénan
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