An Houarbou is a reef site located within the Glenan archipelago. The topography features depths ranging from 10 to 25 metres, offering a stable environment for divers. Conditions are generally manageable, with mild currents and visibility that can reach up to 30 metres. Access to the site is exclusively by boat. Given the water temperature, which fluctuates between 10 and 15 degrees Celsius throughout the year, a well-fitted wetsuit is essential for comfort. This site is suitable for those looking to explore reef structures in a controlled marine environment.

Cale de Beg Meil is a reef site in Brittany and Normandy, France, featuring a varied topography between 5 and 20 metres. Divers should expect close-range exploration of the reef structure, as visibility typically ranges from 5 to 10 metres. The site is accessible via both shore entry and boat charter, with parking available nearby. Conditions are characterised by cool water temperatures between 10 and 15 degrees Celsius and variable currents. Due to the potential for unpredictable currents and low visibility, this site is suited to intermediate divers. Adequate thermal protection, such as a drysuit or a 7mm wetsuit with hood and gloves, is strongly recommended.

Located 8000 metres from the shore, Île aux Moutons is an isolated reef site situated between the mainland and the Glenan archipelago. Access is by boat only, and the site is suitable for intermediate divers due to moderate currents. Conditions can vary, with potential hazards including rip currents, strong currents, and surf. Water temperatures range from 11C in winter to 18C in summer. Species recorded around this area include grey seals, common octopus, European common cuttlefish, squat lobsters, catsharks, wrasses, sea stars, shrimp, crabs, hermit crabs, snails, and rockpool prawns. The site is also well-regarded for snorkelling, with a rating of 4/5.

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.

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.

CIP Glénan offers shore-entry diving across a diverse underwater landscape featuring reefs, caves, and wrecks. Suitable for beginners, the site maintains an average depth of 15 metres, with a range between 5 and 15 metres. Navigation is aided by mild currents, though visibility is variable, reaching up to 15 metres. Water temperatures are cold, ranging from 11 to 16 degrees Celsius, necessitating the use of a 7mm wetsuit or drysuit. Divers should remain vigilant regarding boat traffic during entry and exit. Air fills are available on-site, and the location supports night diving for those interested in nocturnal exploration.

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.