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 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 du Stole on the Île de Groix is a family-friendly beach that offers accessible snorkelling from the shore. At low tide, the site transforms into a series of shallow rock pools and edges, providing a calm environment suitable for beginners. Water temperatures at this location vary throughout the year, ranging from 10C in February to 18C during the summer months between July and September. The site is well-suited for those looking for a relaxed snorkelling experience in a sheltered coastal setting.

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.

Pointe de Pen Men is a reef and wall site located at the western tip of Île de Groix. The topography features a wall dropping to a maximum depth of 22 metres, with an average depth of 15 metres. This site is accessible only by boat due to strong surf and shore breaks at the coast. Divers can expect mild currents and visibility ranging from 5 to 10 metres. Water temperatures fluctuate between 11 and 16 degrees Celsius throughout the year, necessitating appropriate thermal protection. The site is suitable for beginners, though divers should remain vigilant regarding potential entanglement hazards within the reef structures.

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.

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 Melin is a sheltered inlet on the Île de Groix, featuring a diverse underwater topography of rocky walls, reefs, and kelp forests. The site offers an average depth of 8 metres, with a range between 6 and 10 metres. Divers and snorkellers can explore the steep rocky walls that provide a vertical habitat for sponges and kelp. Access is via the shore, and the site is suited for intermediate divers due to moderate currents. Water temperatures fluctuate between 10C and 17C throughout the year. Typical dives last approximately 30 minutes.