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.

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.

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.

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.

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.

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.

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.