Les Hors is a marine dive site located off the coast of Saint-Malo, France, featuring a combination of reef, drop-off, and wreck topography. The site is accessed exclusively by boat and is suited for intermediate divers due to the presence of moderate currents. Divers should be prepared for variable conditions, including the potential for low visibility and strong currents. The water temperature fluctuates between 10C and 18C throughout the year. The habitat supports a variety of temperate marine life, including reef fish and invertebrates typical of the Brittany and Normandy region. Dive facilities in the area provide air fills for visiting divers.

Arcouest is a shallow dive site near Paimpol featuring a combination of natural reef, seagrass beds, and an artificial reef structure. Suitable for beginners, the site reaches depths of 8 to 10 metres with an average of 7 metres. Divers can access the area by boat or from the shore, though shore entries require caution due to surf and shore break. Visibility typically ranges from 5 to 10 metres. Water temperatures fluctuate between 10C and 17C, necessitating appropriate thermal protection. Moderate currents are present, so planning dives around slack water is recommended to manage conditions effectively. Parking is available at the site.

Anse de Launay is a sheltered cove near Saint-Malo featuring a seabed composed of a mix of pebbles and sand. Rocky outcrops flank both sides of the bay, creating a contained environment suitable for beginner snorkellers. Water temperatures in this marine location fluctuate between 10C and 18C throughout the year, with the warmest conditions occurring from July to September. Access to the water is via the shore. The site offers a peaceful setting for observing the local coastal topography and the marine environment associated with the rocky outcrops.

Pointe de l'Arcouest offers a varied underwater topography defined by a labyrinth of pink granite boulders and kelp forests. This shore-entry site is suitable for beginners and provides numerous nooks and crannies within the rocky structure to explore. Water temperatures at this location fluctuate between 10C and 18C throughout the year, with the warmest conditions occurring from July to September. Given the nature of the terrain, snorkellers should be prepared for variable conditions typical of the Brittany coast. The site is well-regarded for snorkelling, offering an accessible experience for those looking to observe the coastal environment of Saint-Malo.

Plage du Guerzido on Île de Bréhat offers a sheltered reef environment suitable for beginners. The site features a mix of sand and rocky reefs, with the eastern rocky edge providing a primary area for exploration. Divers and snorkellers can expect depths ranging from 1 to 8 metres, with an average of 4 metres. Conditions are generally calm, though visitors should remain aware of boat traffic, surge, and cold water temperatures. Visibility typically fluctuates between 5 and 15 metres. Access is via the shore, and the site is supported by local facilities including parking, showers, and nearby dive shops.

Le Charbonnier is a combined reef and wreck site located off the coast of Saint-Malo. Accessible from the shore, the site features depths ranging from 10 to 15 metres. Divers should be prepared for moderate currents and limited visibility, which averages around 5 metres. The wreck presents an overhead environment that requires careful navigation to avoid entanglement risks. Due to the variable conditions and current, booking a guided tour through a local dive shop is recommended. Water temperatures fluctuate between 10C and 16C throughout the year, making a drysuit or thick wetsuit advisable for comfort during the typical 45-minute dive.

Roch Donan is a shore-entry reef dive located off the north Brittany coast near Paimpol. The site reaches depths between 23 and 30 metres. Divers should expect moderate currents and visibility around 5 metres, requiring careful navigation and close buddy contact. Due to the current, it is essential to check local tidal information before entering the water to select the optimal dive window. Divers should arrive self-sufficient, as facilities are not confirmed on site. A surface marker buoy is recommended for this dive. The site is accessible throughout the year, offering flexibility for planning visits to this coastal area.

Plage de Roc'h Hir is a sheltered beach located near the sailing centre of Loguivy-de-la-Mer. This site features rocky reefs along the western side of the bay, which are best explored at high tide. The area is suitable for beginners, offering a shallow environment with depths ranging from 1 to 5 metres and an average of 3 metres. Snorkellers can expect mild currents and visibility between 2 and 8 metres. Water temperatures are cool, fluctuating between 10C and 18C throughout the year, so a wetsuit is recommended for comfort. Shore access is available, and the site provides facilities including parking, toilets, showers, changing rooms, and a cafe.