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.

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.

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.

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.

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.

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.

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.

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.