Grotte de l'Arc en Ciel, located at Île Jarre in the Riou Archipelago, offers a diverse underwater experience combining cave and reef topography. Divers can explore depths ranging from 3 to 25 metres, with an average depth of 15 metres. The site is accessible by both boat and shore, featuring mild currents and visibility between 10 and 30 metres. As the cave section presents an overhead environment, divers must maintain awareness of their surroundings and are strongly advised to use guided tours provided by local dive shops. The site is suitable for beginners, though proper training for overhead environments is essential for navigating the cave safely.

La grotte sans fond is a cavern dive located off Île Jarre in the Riou Archipelago. The site features a cavern structure situated between 15 and 20 metres depth, with an average depth of 17 metres. Visibility typically ranges from 10 to 30 metres, allowing for navigation within the overhead environment. The site is characterised by a lack of current, though divers must manage the risks associated with an overhead environment, including potential entanglement. Access is strictly by boat, as surf and shore breaks make shoreline entry dangerous. This site is suited for intermediate divers who possess solid buoyancy control and awareness of their air supply.

La Grotte Mystérieuse, located off Île Jarre, offers a diverse underwater landscape featuring a cave system, reef, and drop-off. Divers typically explore between 12 and 26 metres, with an average depth of 19 metres. The site is suitable for beginners, though the overhead environment of the cave requires strict buoyancy control and careful depth monitoring. Visibility ranges from 10 to 30 metres, and currents are generally mild. A torch is recommended for navigating the darker cave interior. Access is by boat only, and divers should arrange air fills and equipment in Marseille before departure. A typical dive lasts 50 minutes.

Les Moyadons is a wall and reef site located off the Île de Riou. The topography features a wall dropping to a maximum depth of 37 metres, with shallower reef sections starting above 10 metres. Divers can expect visibility ranging from 10 to 30 metres. This site requires boat access and is suited for intermediate divers due to moderate currents that can strengthen without warning. Water temperatures fluctuate between 14C and 19C throughout the year. Divers should exercise caution to avoid contact with sharp coral and rock edges along the wall. Planning dives to work against the current during the initial phase is recommended.

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.

The Batavia wreck lies off Île Jarre in the Riou Archipelago, offering a wreck diving experience at depths between 3 and 18 metres. This site is suitable for intermediate divers, with visibility typically ranging from 5 to 10 metres and mild currents. Access is by boat only, as the site is located 1000 metres from the shore. Divers should be aware of potential entanglement risks within the wreck structure and the presence of sea urchins near the seabed. Surface boat traffic requires caution during ascent. Water temperatures fluctuate throughout the year, ranging from 14C in winter to 21C in August.

Grotte de Boulegeade at Île de Riou offers a diverse underwater experience combining a cave system, reef, wall, and drift diving. Depths range from 7 to 45 metres, with an average of 28 metres. Divers encounter moderate currents, particularly near the cave entrance. Visibility typically spans 15 to 25 metres. Marine life includes wrasses, scorpionfish, common octopus, Mediterranean moray, and various nudibranchs such as the tricolor doris and cratena slug. Due to the overhead environment and depth, this site is suited for intermediate divers with appropriate training. Access is by boat only, and a torch is recommended for navigating the cave interior where natural light diminishes rapidly.

La Donatello D is a reef and wall site located off the Île de Riou, offering a shallow profile between 9 and 12 metres. This site is well-suited for beginner divers due to the manageable depths and generally calm conditions. Visibility typically ranges from 10 to 30 metres, providing clear sight lines along the reef structure. Access to the site is exclusively by boat, and divers must remain vigilant regarding boat traffic when surfacing. A surface marker buoy is recommended for all ascents. Water temperatures fluctuate between 14 and 23 degrees Celsius throughout the year, necessitating appropriate thermal protection during cooler months.