Ouest Four is a combined reef and wreck site located 7400 metres off the coast of the Morbihan Islands. Divers can explore depths ranging from 18 to 22 metres, with an average depth of 20 metres. The site is suitable for beginners, though conditions require careful navigation due to visibility between 5 and 10 metres and mild currents that may strengthen. A boat is required to reach the site, and a surface marker buoy is essential for safety during ascent due to heavy boat traffic. Species recorded around this area include various crabs, sea stars, and molluscs. Divers should avoid contact with the seabed to prevent injury from sea urchins.

Plateau du Four is an offshore reef located 7400 metres from the coast, surrounding the Phare du Four lighthouse. This site is suited for advanced divers due to strong currents and depths ranging from 14 to 35 metres, with an average depth of 25 metres. Visibility varies between 10 and 30 metres. Water temperatures fluctuate between 10C and 15C, with a thermocline often present from spring through summer. Access is by boat only. Species recorded around this area include various crabs, sea stars, sea slugs, and cuttlefish. The site is designated as a Natura 2000 area.

The Épave Laos is a wreck located 550 metres from the shore in the Morbihan Islands, France. Resting at an average depth of 12 metres, with a range of 10 to 15 metres, this site is suitable for beginner divers. Visibility typically spans 10 to 15 metres, allowing for clear observation of the wreck structure. Divers should be prepared for moderate currents and must navigate a surf zone during shore entry and exit. It is recommended to time movements carefully to avoid the shore break. Water temperatures fluctuate between 10C and 17C throughout the year, necessitating appropriate thermal protection.

The Laos Wreck is an artificial reef located 7400 metres offshore from the Morbihan Islands. Resting at depths between 10 and 15 metres, with an average of 12 metres, this site is suitable for beginner divers. The wreck structure requires careful navigation due to potential entanglement risks and sharp metal surfaces. Divers should expect visibility ranging from 5 to 10 metres and mild currents. Water temperatures fluctuate between 10C and 18C throughout the year, necessitating appropriate thermal protection. Access to the site is by boat only, and divers should consult local operators for transport arrangements.

Pen Bron is a marine dive site located within the Morbihan Islands of France. The site features a consistent depth of 9 metres. Water temperatures in this area fluctuate throughout the year, ranging from a minimum of 10C in the winter months to a maximum of 18C during August. Due to the variable nature of the local environment, divers should be prepared for changing conditions. This site is suitable for those seeking a shallow dive experience in the Brittany and Normandy region.

Port au Roc is a rocky reef located on the southwest point of Le Croisic in the Morbihan Islands. This shore-entry site offers a shallow, protected environment suitable for beginners, with depths ranging from 1 to 14 metres and an average of 6 metres. Visibility typically spans 5 to 10 metres. While the site is generally calm, divers should remain aware of potential surf and strong currents in the area. The rocky seabed provides a stable platform for both day and night diving activities. It is also accessible for snorkelling, holding a rating of 3 out of 5.

Plage du Castouillet is a small, sandy cove located on the northwest of the peninsula in the Morbihan Islands. The site features rocky edges formed by large granite boulders, creating a sheltered environment suitable for beginners. Diving depths range from 1 to 8 metres, with an average depth of 4 metres. Access is via the shore, and conditions typically include mild currents and visibility between 4 and 10 metres. Water temperatures fluctuate between 10C and 18C throughout the year. Facilities available at the site include parking, toilets, and showers. Divers should be aware of sea urchins present in the area.

Saint-Goustan is a reef and artificial reef site located at the foot of the Tréhic jetty in the Morbihan Islands. The site features rocky areas that benefit from constant water exchange. Divers and snorkellers should be aware of moderate currents and potential surf conditions. Access is via the shore, and the site is best suited for intermediate divers. Facilities available at the location include toilets, showers, and first aid. Water temperatures fluctuate throughout the year, ranging from 10C in winter to 19C in late summer. Snorkellers are advised to remain close to the rocky structures and avoid the main channel current.