La Pierre de Cassis is a boat-accessible dive site located off the Île de Riou in the Riou Archipelago. The site features a consistent depth of 25 metres. Divers can expect moderate currents throughout the area. Visibility at this location typically ranges between 10 and 30 metres depending on conditions. Water temperatures fluctuate seasonally, reaching a low of 14C in the winter months and peaking at 20C in August. Due to the depth and current conditions, this site is best suited for experienced divers. There is no specific marine life data available for this location.

Les Bankaws is a reef site located off the Île de Riou near Marseille. This boat-access dive reaches depths of 25 to 30 metres, with an average depth of 27 metres. Divers should be prepared for moderate currents and surge, which require good buoyancy control. Visibility at the site fluctuates between 10 and 30 metres. Given the depth and potential for shifting conditions, this site is suited for intermediate divers. Water temperatures range from 13C in winter to 20C in August. A 5 mm wetsuit is the minimum recommended, though many divers prefer a 7 mm suit or drysuit outside of the summer season.

Couloir aux Gorgones is a technical wall dive located off the Île de Riou. The site features a vertical drop starting at 20 metres and extending to a maximum depth of 62 metres, with an average depth of 50 metres. Divers experience moderate currents, making this a drift dive suitable only for advanced divers. Visibility typically ranges between 10 and 30 metres. Water temperatures are cool, fluctuating between 13 and 18 degrees Celsius throughout the year. Due to the significant depths and potential for accelerating currents, precise gas management and the use of a surface marker buoy are required. Access is exclusively by boat.

Le Tombant de Sophie is a reef site located off the coast of Île de Riou near Marseille. The topography features a reef that slopes from the surface down to depths of 50 metres. Divers typically access the site by boat. Conditions are generally calm with mild currents, making the shallower sections suitable for those gaining experience. Visibility at the site ranges between 5 and 10 metres. Water temperatures fluctuate throughout the year, ranging from 14C in the winter months to 24C during the peak of summer. Divers should plan for appropriate thermal protection based on the seasonal temperature variations.

Pain de Sucre is a compact site located off the Île de Riou, featuring a diverse topography of reef, wall, drop-off, and pinnacle. Divers can expect depths between 20 and 26 metres. The site is defined by strong, shifting currents that require careful planning and energy management during the ascent. Visibility is variable, ranging from 10 to 30 metres depending on conditions. Water temperatures fluctuate between 14 and 19 degrees Celsius throughout the year, necessitating appropriate thermal protection. Access to this site is by boat only, and it is recommended for intermediate divers comfortable with moving water.

La pointe de Caramasagne is a shallow reef site located at Île de Riou. The site offers visibility ranging from 10 to 30 metres, allowing for clear views across the reef structure. Divers should be prepared for moderate currents, which can affect movement even at shallower depths. Water temperatures fluctuate between 14C and 24C throughout the year, necessitating appropriate thermal protection. Access is primarily by boat. Given the presence of moderate currents, divers are advised to monitor their position along the reef and maintain close contact with their buddy. The site is suitable for various experience levels, though local conditions should be checked prior to entry.

Fora Simona is an advanced dive site located off the Île de Riou, featuring a diverse topography of reefs, walls, drop-offs, and caves. The site ranges from 20 to 60 metres in depth, requiring precise buoyancy control and gas management. Divers encounter moderate currents that can strengthen, impacting ascent and descent. Visibility typically spans 10 to 30 metres. Marine life includes common sightings of Mediterranean moray, scorpionfish, wrasses, and various nudibranchs such as the tricolor doris and flatworms. Great barracuda, conger eels, and flamingo tongue are also recorded. Access is by boat only, and a 7mm wetsuit is recommended to manage water temperatures between 13C and 18C.

Tombant de David is a shore-entry wall and drop-off site located at Île de Riou. The topography descends from 10 to 40 metres, with an average depth of 20 metres. Divers encounter moderate currents along the vertical seascape, making this site suitable for intermediate divers. Water temperatures range from 14 to 17 degrees Celsius, necessitating at least a five-millimetre wetsuit. Visibility can be variable, requiring careful orientation in deeper sections. Marine life recorded here includes Mediterranean moray, great barracuda, wrasses, scorpionfish, and various nudibranchs such as the Cratena slug, Mediterranean violet aeolid, and Felimare orsinii. Other inhabitants include cow snails, flatworms, gorgon's head, Turkish wrasse, tricolor doris, flamingo tongue, and squat lobster.