Plage du Pérello on the Île de Groix is a sheltered cove featuring a sandy bottom framed by rocky ridges. This site is suitable for beginners, offering a shallow snorkeling experience with depths ranging from 1 to 10 metres and an average depth of 5 metres. Access is via the shore, and the area experiences mild currents. Visibility typically fluctuates between 5 and 15 metres. Visitors should be aware of potential surf conditions. On-site facilities include parking, toilets, showers, and a rinse station for equipment.

Anse de Kerguelen on Île de Groix offers a shallow marine environment featuring rocky reef structures and seagrass meadows. With an average depth of 3 metres, this shore-entry site is suitable for beginners and provides a 3/5 rating for snorkelling. Divers should be aware of moderate currents, potential surf, and boat traffic, alongside variable visibility and cold water temperatures ranging from 10C to 18C. Species recorded around this area include wrasses, conger eels, various crustaceans such as crabs and shrimp, and echinoderms like sea stars. Facilities at the site include parking, toilets, showers, equipment rental, and a dive shop for air fills.

Port Blanc at Kerroc'h is a rocky reef site located on the Île de Groix. This shore entry location features a rugged topography characterised by deep crevices and kelp forests accessible with a short swim. The site is suitable for beginners and offers mild currents. Water temperatures fluctuate between 10C and 18C throughout the year, making wetsuits advisable outside of the summer months. Facilities available at the site include parking, toilets, and showers. Divers and snorkellers should be aware of potential hazards including jellyfish and sea urchins in the area.

Plage des Kaolins on Île de Groix offers a reef environment accessible from the shore. The site features rocky sections at either end of a long sandy stretch, providing varied topography for snorkelers. Depths range from 1 to 15 metres, with an average depth of 5 metres. Conditions include moderate currents and potential surf, requiring intermediate skill levels. Visibility typically spans 5 to 10 metres. Water temperatures fluctuate between 10C and 18C, making cold water shock a consideration for those entering the water. Facilities at the site include parking, toilets, and showers.

Sperrbrecher 134 is a wreck dive located 800 metres off the coast of Île de Groix, France. The vessel rests at depths between 22 and 25 metres, with an average depth of 22 metres. Access is exclusively by boat charter. Divers encounter mild currents and visibility ranging from 3 to 10 metres. Due to the wreck structure, entanglement is a primary hazard, requiring careful navigation. Water temperatures remain between 10 and 15 degrees Celsius, necessitating a drysuit or a 7mm wetsuit with a hood. Carrying a primary and backup torch is recommended to assist with visibility when exploring the wreck's interior.

Tahiti Beach on Île de Groix is a shallow reef site suitable for beginner divers. The site features a consistent depth of 6 metres and is accessed directly from the shore. Conditions are generally mild, though visibility can vary between 3 and 10 metres. Divers should be prepared for cold water temperatures, which range from 10°C to 17°C throughout the year. Facilities available at the site include parking, showers, and toilets. Due to the low water temperatures, appropriate thermal protection is recommended for all dives.

Port Lay is a sheltered reef site located on Île de Groix, France. Divers access the water from the shore behind the seawall, making it a suitable location for beginners. The site features depths ranging from 5 to 15 metres, with an average depth of 10 metres. Conditions are generally mild, though divers should remain aware of boat traffic in the area. Facilities available at the site include air fills, a dive shop, guided tours, parking, toilets, and showers. Night diving is possible here, and the site is also suitable for snorkelling. Species recorded around this area include wrasses, conger eels, sea stars, crabs, and various molluscs.

Kelhuit is a reef dive located 800 metres off the coast of Île de Groix, France. This site is well suited for beginner divers, offering a shallow profile that ranges from 1 to 15 metres with an average depth of 8 metres. Access is by boat only. Divers can expect mild currents and visibility typically between 5 and 10 metres. The site is suitable for night diving, allowing for a different perspective of the reef structure. Water temperatures fluctuate between 10 and 17 degrees Celsius throughout the year, necessitating appropriate thermal protection such as a 7mm wetsuit during colder months. Typical dive duration is approximately 40 minutes.