Bassin du Commerce is an enclosed seawater basin located in the heart of Le Havre, France. This urban site offers a protected environment suitable for beginner snorkellers. The water temperature fluctuates throughout the year, ranging from 8C in February to 20C in August. Visibility is typically limited to 2 to 3 metres. Access to the water is via the shore. As an enclosed basin, it provides a controlled setting for those practising basic snorkelling skills in a marine environment.

Le Bout du Monde is located at the northern tip of the main beach in Le Havre, where the promenade meets the cliffs. This site features a combination of natural reef and artificial reef structures, including rocky groynes and submerged boulders that offer shelter. It is suitable for beginners, with depths ranging from 1 to 5 metres. Access is via the shore, and conditions include mild currents and visibility between 2 and 8 metres. Water temperatures fluctuate between 9C and 19C throughout the year. Divers and snorkellers should be aware of potential hazards including entanglement, low visibility, and surf. Facilities available on-site include parking, toilets, showers, and a cafe.

Saint-Jouin-Bruneval features a rocky reef flat at the northern end of a wide pebble beach. The site is accessible from the shore, with the reef structure exposed as shallow pools and channels during low tide. Divers and snorkellers should be aware of strong currents and surf conditions in this area. Water temperatures are cool, fluctuating between 9C and 19C throughout the year, necessitating appropriate thermal protection. Facilities at the beach include parking, toilets, and showers. Due to the variable conditions and currents, this site is best suited for those comfortable with shore entries in a marine environment.

Plage d'Antifer is a secluded beach located on the Alabaster Coast of France, west of Étretat. The site features rocky points at both ends of the beach, which provide the primary areas for snorkelling. Access to the water is via a shore entry, requiring a 1.5km walk through a valley to reach the beach. Conditions at this site vary, with water temperatures ranging from 9C to 19C throughout the year and visibility that can be limited. Due to the potential for surf, surge, and strong currents, this site is best suited for intermediate snorkelers. Parking is available near the access point.

Porte d'Aval is a shore-entry snorkel site located along the Alabaster Coast in France. The topography features a rocky seabed characterized by walls and natural arches, which create crevices throughout the area. This site is suited for intermediate snorkellers due to the presence of moderate to strong currents, surf, and potential rip currents. Visibility can be low, and water temperatures remain cold throughout the year, ranging from 9°C to 19°C, necessitating the use of a wetsuit. Facilities available at the site include parking, toilets, and showers.

La Plage D'etretat is a shallow marine dive site located in France. The site features a consistent depth of 4 metres. Water temperatures at this location vary throughout the year, ranging from a low of 9C in February and March to a high of 19C during August and September. Given the shallow nature of the site, it is suitable for those seeking a straightforward, limited-depth experience. Divers should be prepared for variable conditions typical of the region. There is no specific data regarding marine life at this location.

Vaucottes Beach is a pebble beach situated between high cliffs, featuring rocky reefs on both sides of the bay. This marine site is suitable for intermediate divers and offers shore access. Conditions are variable, with strong currents present, requiring careful planning. Water temperatures fluctuate significantly throughout the year, ranging from 9C in the winter months to 19C in August. Divers should be prepared for cold water, with a thick wetsuit, hood, and boots recommended during the cooler periods. The site is also well-regarded for snorkelling, which holds a 4/5 rating.

Cap Fagnet is located at the southern end of Fécamp beach near the channel entrance. The site features a combination of natural rocky cliff bases and artificial underwater structures from old harbour works. Divers and snorkellers can explore this varied topography at depths ranging from 2 to 6 metres, with an average depth of 4 metres. Access is via the shore. Conditions are variable, with visibility between 2 and 8 metres and moderate currents. Hazards include boat traffic, entanglement risks, jellyfish, sea urchins, strong currents, and surf. Facilities available at the site include parking, toilets, showers, and changing rooms.