Cale De Ploumanac'h is a shore-entry dive site located near Saint-Malo, France, featuring a combination of reef and kelp forest topography. The site reaches depths between 9 and 20 metres, with an average depth of 12 metres. Divers should be prepared for strong currents and surf conditions, which require an intermediate skill level. Visibility typically ranges from 5 to 10 metres. Water temperatures are cool, fluctuating between 10C and 15C throughout the year. The site is equipped with nearby parking, toilets, showers, and changing rooms, and supports night diving. Dive shops in the area provide air fills, equipment rental, and guided tours.

Ranolien is a reef site located 100 metres from the shore near Trebeurden. The reef lies at depths between 10 and 16 metres, with an average depth of 13 metres, making it suitable for beginner divers. Divers can access the site from both the shore and by boat. Visibility typically ranges from 5 to 10 metres, and the area experiences moderate currents. To ensure a comfortable dive, it is recommended to time entries around slack water. On-site facilities include parking, toilets, showers, changing rooms, air fills, equipment rental, a cafe, first aid, a dive shop, and boat charter services.

Ploum'Aqua is a shore-entry dive site in Saint-Malo, France, featuring a mix of reef and wreck topography. Suitable for beginners with an Open Water certification, the site offers a typical dive duration of 30 minutes. Divers may encounter European Common Cuttlefish, wrasses, cod, and various crabs including rock crabs and European green crabs. Other observed life includes snails, sea squirts, shanny, clingfish, and rockpool prawns, alongside soft coral. Water temperatures range from 10C to 18C, necessitating appropriate thermal protection. Entry requires caution due to surf and a significant shore break, and divers should monitor local conditions to manage moderate currents.

Chocolaterie Comort is a shore-entry reef dive located in Saint-Malo, France. This site features shallow depths, making it a practical choice for divers looking to gain experience in French Atlantic waters. Visibility at the site is variable and changes between visits. Water temperatures fluctuate throughout the year, ranging from 10 degrees Celsius in winter to 18 degrees Celsius in late summer. Due to these conditions, a 7mm wetsuit or a drysuit is recommended for comfort outside of the summer months. Divers should check locally for facility availability before arrival, as amenities are not guaranteed on site.

Le Castel in Saint-Malo is a protected Natural Area featuring extensive eelgrass beds and pink granite outcrops. This shore-entry site offers shallow waters starting from one metre, making it suitable for beginners and snorkellers. Conditions are generally calm with mild currents, providing a comfortable environment for exploration. Water temperatures range from 10C in March to 17C in August and September. Divers can expect typical dive durations of 45 minutes. On-site facilities include changing rooms, showers, air fills, equipment rental, and boat charter services provided by the local dive shop.

Crique du Squeouel is a small creek located north of the port in Saint-Malo, France. The site features rocky walls that descend into sandy bottoms, providing a sheltered environment for snorkelling. Access is via the shore, and the site is best suited for intermediate snorkellers due to the variable conditions of the region. Water temperatures fluctuate between 10C and 17C throughout the year. Species recorded around this area include wrasses, European common cuttlefish, tompot blennies, sea stars, various crab species, soft corals, cod, spirographs, snails, sea squirts, and shannies.

Baie des Pirates in Saint-Malo is a sheltered bay frequently utilised for snorkelling initiations. The site features shallow rocky reefs that provide a habitat for juvenile fish and various Atlantic algae. With water temperatures ranging from 10C to 17C throughout the year, the site is suitable for beginners. Access to the water is available from both the shore and by boat. Conditions at this location are variable, and it is recommended that snorkellers remain aware of the local environment while exploring the rocky topography.

Roche aux Serpents is an offshore rock formation located 500 metres from the shore near Saint-Malo. The site features a topography of deep gullies and swim-throughs, supporting a kelp forest environment. Divers and snorkellers can expect depths ranging from 5 to 18 metres, with an average depth of 4 metres. Access to the site is by boat only. Conditions include moderate currents and water temperatures typically between 10C and 14C, though seasonal variations may occur. The site is suitable for intermediate divers and offers a snorkel rating of 4 out of 5. Guided tours and local dive shop support are available for those visiting this area.