Le Natal is a deep wreck dive located off the Île de Riou, resting at depths between 120 and 130 metres. This site is strictly for technical divers, requiring trimix certification and redundant equipment. The environment features moderate currents and visibility ranging from 10 to 30 metres. Water temperatures remain cool, fluctuating between 13 and 16 degrees Celsius throughout the year. Access is exclusively by boat, and divers must remain vigilant regarding entanglement risks near the wreck structure. Due to heavy boat traffic in the area, the use of a surface marker buoy is essential during ascent to ensure safety.

Les Deux Jumelles is a deep reef and wall site located off the Île de Riou. The topography consists of a steep wall dropping to depths between 57 and 65 metres, with an average depth of 61 metres. This site is strictly for advanced divers with deep diving certifications, as the depth presents the primary hazard. Conditions include mild currents and visibility ranging from 5 to 10 metres. Due to the significant depth and water temperatures between 13 and 18 degrees Celsius, a drysuit or thick wetsuit with hood and gloves is recommended. Boat access is required, and guided tours are available locally to assist with navigation and safety.

Le Couloir aux gorgones is a boat-access reef located off the Île de Riou near Marseille. The site features depths ranging from 25 to 36 metres, requiring appropriate depth certification and buoyancy control. Divers typically encounter moderate currents, making it necessary to plan dive profiles carefully and utilise the reef for shelter. Visibility at the site varies between 10 and 30 metres depending on local conditions. Water temperatures fluctuate between 13 and 19 degrees Celsius throughout the year, necessitating a thick wetsuit or drysuit for thermal protection. Given the depth and current, this site is best suited for experienced divers.

L'Impérial du milieu, located off the Île de Riou, is a diverse site featuring a combination of reef, wall, and canyon topography. Divers can explore depths ranging from 5 to 46 metres, with an average depth of 25 metres. The site is suitable for intermediate divers and requires boat access. Conditions include moderate currents and visibility between 10 and 30 metres. Marine life is abundant, with common sightings of Mediterranean moray, wrasses, scorpionfish, flatworms, and cow snails. Less frequently, divers may encounter great barracuda, Turkish wrasse, Gorgon's head, and various nudibranch species including Cratena slug, Mediterranean violet aeolid, Felimare orsinii, tricolor doris, giant doris, and flamingo tongue.

Bosse du Chameau is a reef site located at Île de Riou, France. The site features a profile that drops from the surface to a maximum depth of 42 metres. Due to the depth and variable conditions, it is suited for intermediate divers. Access to the site is by boat only. Visibility and currents are variable, so it is recommended to consult a local dive operator to determine the best window for your visit. Water temperatures range from 13 to 19 degrees Celsius throughout the year, necessitating appropriate thermal protection such as a thick wetsuit or drysuit, particularly when exploring the deeper sections of the reef.

Calanque des Contrebandiers is a sheltered reef site located at Île de Riou in the Riou Archipelago. Accessible by boat, the site features a shallow reef environment characterised by mild currents. Visibility at this location typically ranges between 10 and 30 metres. Water temperatures fluctuate throughout the year, reaching a maximum of 24 degrees Celsius in August and dropping to 14 degrees Celsius in the winter months. Divers should plan their thermal protection according to the season. As conditions are generally calm, the site is suitable for those looking for a relaxed diving experience in the French Riviera and Provence region.

Iles des Moyades is a marine site located at Île de Riou, featuring a varied topography of reefs, walls, and canyons. The site reaches depths between 5 and 45 metres and is accessible only by boat. Divers and snorkellers can expect mild currents and visibility ranging from 10 to 25 metres. Water temperatures fluctuate between 13C and 18C throughout the year. Due to the presence of surf, appropriate caution is advised during entry and exit. Typical dives at this location last approximately 45 minutes.

Grotte du Corail is a cave and reef site located off the Île de Riou. This site offers a combination of open-water reef diving and an overhead cave environment, with depths ranging from 15 to 30 metres. Divers encounter Mediterranean moray, scorpionfish, wrasses, and various nudibranchs including Cratena slug and tricolor doris. Visibility typically spans 10 to 25 metres. Due to the overhead environment and sharp rock surfaces, solid buoyancy control is essential. The site is accessible only by boat and is suitable for intermediate divers. Water temperatures fluctuate between 14 and 20 degrees Celsius throughout the year, and night diving is permitted.