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.

Baie des Sables Menus is a family-friendly cove located near the Pierre Longue menhir in the Morbihan Islands. This site offers a relatively shallow and protected environment, making it suitable for beginner snorkellers. The topography features rocky reefs on either side of the bay, providing a sheltered area for exploration. Water temperatures fluctuate throughout the year, ranging from 10C in winter to 19C in August. Access to the water is via the shore. Species recorded around this area include various crabs, sea stars, brittle stars, shrimp, wrasses, sea slugs, flatworms, and occasional sightings of cuttlefish and jellyfish.

Baie de Douillard in the Morbihan Islands is a rocky coastal site featuring shallow submerged ledges and rock pools. This shore-entry location is suited for intermediate snorkelers, with depths ranging from 1 to 5 metres. Visibility at the site varies between 3 and 8 metres. Conditions are influenced by moderate currents and surf, which can be strong. Water temperatures remain cool throughout the year, fluctuating between 10C in winter and 19C during August. Parking is available for visitors. Due to the physical nature of the coastline and water conditions, this site requires careful navigation.

Port Lin is a shore-accessible reef site located in the Morbihan Islands. The area features a sandy beach flanked by rocky outcroppings at the eastern and western ends, which are best explored at mid-to-high tide. With depths ranging from 1 to 5 metres and an average of 3 metres, this site is suitable for beginners. Conditions are generally mild, though water temperatures remain cool, peaking at 19C in August. A wetsuit is recommended for comfort. Species recorded around this area include various crabs, sea stars, and wrasses, alongside occasional sightings of cuttlefish and jellyfish. Facilities at the site include parking, showers, and toilets.

Baie du Crucifix in the Morbihan Islands consists of a series of small, wild coves featuring a labyrinth of rocks. These rock formations create calm pockets suitable for snorkelling. The site is accessible from the shore and is appropriate for beginners, though snorkelers should be aware of moderate currents in the area. Water temperatures fluctuate throughout the year, ranging from 10C in winter to 19C in August. Facilities available at the site include parking, toilets, and showers. Due to the rocky nature of the environment, visitors should exercise caution regarding potential hazards.

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.

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.