Conditions & tides
Scored by DiveConnect's site-physics model
Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.
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About this site
Porth Castell, also known locally as McGees, sits on the Llyn Peninsula coast in northwest Wales, United Kingdom. It is generally rated an intermediate dive. Divers here have reported Atlantic beadlet anemones, common sea stars, edible crabs, European green crabs, lightbulb sea squirts, and velvet swimming crabs among the life on the seabed.
AI overviewMarine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Velvet Swimming CrabNecora puberReported here · unconfirmed
Edible CrabCancer pagurusReported here · unconfirmed
European Green CrabCarcinus maenasReported here · unconfirmed
Common Sea StarAsterias rubensReported here · unconfirmed
Atlantic Beadlet AnemoneActinia equinaReported here · unconfirmed
Lightbulb Sea SquirtClavelina lepadiformisReported here · unconfirmed
Durable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
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