Plage de l'Île Saint-Nicolas is a shallow lagoon located in the Glenan archipelago, offering a sheltered environment for snorkelling. The site features a mix of sandy and rocky seabed, supporting habitats including reefs, kelp forests, and seagrass. With depths ranging from 1 to 5 metres and an average of 3 metres, it is well-suited for beginners. Entry is directly from the shore. Visibility typically varies between 10 and 25 metres, and currents are generally mild. Water temperatures fluctuate throughout the year, ranging from 11C in winter to 18C during the summer months.

Plage de la Pie, located on the southern side of Saint-Nicolas, offers a sheltered snorkelling experience within the Chambre lagoon. The site features a diverse topography consisting of seagrass meadows interspersed with rocky patches. With depths ranging from 1 to 15 metres and an average of 6 metres, it is well-suited for beginners. Access is via the shore, and conditions are generally mild with visibility varying between 5 and 25 metres. Water temperatures fluctuate throughout the year, reaching a maximum of 18C during the summer months. This site provides a accessible environment for observing the local marine habitat in the Brittany and Normandy region.

Bananec Island Tombolo is a shallow marine site in Brittany and Normandy, France, accessible via a sand tombolo from Saint-Nicolas at low tide. The site features a combination of rocky reef and seagrass habitats, with depths ranging from 1 to 10 metres and an average depth of 5 metres. Snorkellers can expect mild currents and visibility between 5 and 15 metres. Water temperatures fluctuate seasonally between 11C and 18C. The site is suitable for beginners, though caution is advised regarding sea urchins and sharp rock formations. Typical snorkel sessions last approximately 60 minutes.

Guiriden Island Sandbank is a reef site located 50 metres from the shore near Glenan. This sandbank emerges at low tide, creating a shallow environment with depths ranging from 1 to 5 metres and an average of 3 metres. The site is suitable for beginners and offers visibility between 10 and 20 metres. Water temperatures fluctuate between 11C and 18C, presenting a risk of hypothermia. Access is available from both shore and boat. Hazards include jellyfish, sharp coral, and surf. Facilities nearby include a cafe, a dive shop, and guided tours. The site is rated 5/5 for snorkelling.

Fort Cigogne is an artificial reef site located 50 metres from the shore in the Glenan area of France. Divers and snorkellers explore the submerged granite blocks forming the base of this historic fort. The site is situated within the Chambre, providing calm conditions suitable for beginners. Depths range from 1 to 10 metres, with an average depth of 5 metres. Visibility varies between 5 and 20 metres, and currents are generally mild. Access is available from both shore and boat. Water temperatures fluctuate between 11C and 18C throughout the year. Guided tours and local dive shop facilities are available to support visitors.

Plage de la Pie on Penfret Island offers a varied underwater landscape featuring rocky ridges and extensive kelp forests. This site is suitable for intermediate divers, with depths ranging from 0 to 18 metres. Access is available from both the shore and by boat. Conditions generally feature mild currents, though divers should remain aware of potential entanglement hazards within the kelp. Water temperatures are cool, typically ranging between 11C and 15C throughout the year, making a wetsuit necessary for comfort. Guided tours are available, and the site is also well-regarded for snorkelling.

Stervat Cove on Île du Loc'h is a sheltered reef and kelp forest environment located within the Brittany and Normandy region. The site features a rocky topography suitable for beginners, with depths ranging from 0 to 18 metres and an average depth of 9 metres. Divers and snorkellers can expect mild currents in this marine setting. Shore access is available, and the site is supported by facilities including toilets, showers, changing rooms, a rinse station, air fills, a dive shop, and guided tours. Water temperatures fluctuate between 11C and 16C throughout the year.

The Pietro Orseolo is a wreck and artificial reef located in Brittany and Normandy, France. This site is suitable for intermediate divers and requires boat access. The wreck lies at depths ranging from 17 to 35 metres, with an average depth of 26 metres. Divers should be prepared for moderate currents and visibility that varies between 3 and 20 metres. Due to water temperatures ranging from 10 to 14 degrees Celsius, a drysuit is necessary. Hazards at this site include potential entanglement and the overhead environment of the wreck. Typical dives last approximately 30 minutes. Species recorded around this area include seals, cuttlefish, octopus, squat lobsters, wrasses, catsharks, abalone, crabs, and various crustaceans.