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.

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.

Pierre qui Tremble, located at Île de Riou, offers a diverse underwater landscape featuring a reef, a wall, and a cave. Suitable for beginners, the site allows divers to explore shallower areas at 6 metres before descending to a maximum depth of 25 metres. Visibility typically ranges from 10 to 25 metres, providing clear views of the topography. While currents are generally mild, they can strengthen unexpectedly, requiring careful monitoring. Water temperatures fluctuate between 14C and 20C throughout the year, necessitating appropriate thermal protection. Access to this site is strictly by boat, and divers should maintain close contact with their boat operator for safe entry and exit.

Le Pouar is a reef and cavern site located off the Île de Riou. The topography ranges from 3 to 35 metres, with an average depth of 18 metres, making it suitable for beginners in the shallower sections while offering more challenging terrain deeper down. Access is by boat only, situated 2000 metres from the shore. Divers should be prepared for mild currents, though surge and swell can occur, which may impact visibility. Water temperatures fluctuate between 13 and 19 degrees Celsius throughout the year, necessitating appropriate thermal protection. Typical dive times are approximately 40 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.

Le Voilier de Plane is a wreck dive located off the coast of the Île de Riou. The site sits at a constant depth of 33 metres, requiring boat access and intermediate diving skills. Divers should be prepared for moderate currents, which necessitate careful planning of descent and bottom time. Visibility at the site ranges from 10 to 30 metres depending on seasonal conditions. Water temperatures fluctuate between 13 and 20 degrees Celsius throughout the year. Due to the depth and potential for cooler water, a thick wetsuit or drysuit is recommended, particularly outside of the summer months.