Anse des Fossettes is a sheltered bay on the Saint-Jean-Cap-Ferrat peninsula, featuring an official underwater trail known as the Sentier Sous-Marin. This marked route uses buoys and information panels to guide snorkelers through the bay. The site is suitable for beginners, with depths ranging from 0 to 8 metres and visibility typically between 10 and 30 metres. Access is via the shore, and the area includes facilities such as showers and a nearby cafe. Water temperatures fluctuate seasonally between 14C and 26C. Snorkelers should be aware of the potential presence of jellyfish in the water.

Les Fosses is a shore-entry site located at Cap Ferrat, featuring a combination of natural reef and artificial reef structures. The site is suitable for beginners and offers shallow water access. Conditions at the site vary, with visibility and currents changing depending on the day. Water temperatures fluctuate significantly throughout the year, ranging from 14C in the winter months to 26C during the summer. Divers should select appropriate thermal protection based on the season. On-site facilities include showers, and the location is accessible for diving year-round.

Plage des Fosses at Cap Ferrat offers a accessible shore entry suitable for beginners. The site features a combination of natural and artificial reef structures across a depth range of 1 to 9 metres, with an average depth of 5 metres. Divers experience mild currents and visibility ranging from 5 to 15 metres. Water temperatures fluctuate between 14C and 25C throughout the year, requiring appropriate thermal protection. On-site showers are available for rinsing equipment after dives. Be aware of jellyfish in the water column; a full wetsuit or skin suit is recommended for protection.

Sec de Merlo is a deep offshore seamount located 1000 metres off Cap Ferrat. The site features a complex topography of reefs, walls, drop-offs, and cave sections, rising from a depth of 60 metres to a shallowest point of 30 metres. Divers experience consistent visibility of 30 metres. Due to the depth, moderate currents, and potential for nitrogen narcosis, this site is reserved for advanced divers. Access is strictly by boat, and divers must manage decompression requirements and monitor gas consumption closely. Surface marker buoys are essential to remain visible to frequent boat traffic in the area.

Pointe Caussinière at Cap Ferrat features a varied topography consisting of a reef, wall, and drop-off. The site is suitable for intermediate divers, with depths ranging from 3 to 45 metres and an average depth of 35 metres. Access is strictly by boat. Conditions are variable, with visibility typically between 10 and 25 metres and mild currents. Water temperatures fluctuate throughout the year, ranging from 14C in the winter months to 21C during the summer. Divers and snorkellers should remain aware of boat traffic in the area, as well as potential surf and currents.

Le tombant de Villefranche is a wall dive located at Cap Ferrat, featuring a drop-off that descends from 5 metres to 45 metres. The site includes a reef and a cave, with visibility ranging from 10 to 30 metres. Divers frequently encounter wrasses, scorpionfish, white seabream, and sea stars. Less common sightings include Mediterranean moray, European common cuttlefish, gurnard, and various nudibranchs like the splendid elysia and cratena slug. The site is suitable for beginners, though boat traffic requires vigilance during surfacing. Guided tours are available, and a wetsuit is recommended due to water temperatures between 13 and 20 degrees Celsius.

Grotte du Sémaphore at Cap Ferrat offers a diverse underwater landscape featuring a cave, a drop-off, and a reef. Reaching depths between 9 and 40 metres, the site is accessible to beginners who should remain in the shallower sections. Divers encounter various marine life, including common wrasses, scorpionfish, white seabream, and sea stars. Less frequently, observers record Mediterranean moray, lefteye flounder, gurnard, and various nudibranchs like the Cratena slug. The site requires boat access and presents mild currents with visibility ranging from 10 to 30 metres. Due to the overhead cave environment, maintaining buoyancy control is essential. Guided tours are recommended to navigate the layout safely while avoiding contact with the reef and cave walls.

Grande Baie at Cap Ferrat offers a diverse underwater landscape featuring a reef, wall, cave, and drop-off, alongside an artificial reef. Suitable for beginners, the site reaches depths between 2 and 60 metres with visibility ranging from 10 to 25 metres. Divers can encounter common species such as wrasses, scorpionfish, sea stars, and white seabream. Less frequently, the site hosts Mediterranean moray, European common cuttlefish, Turkish wrasse, lefteye flounder, gurnard, splendid elysia, cow snails, cratena slugs, tube worms, and brittle stars. Entry is possible from both shore and boat, with mild currents typically present. Water temperatures fluctuate between 13C and 19C throughout the year.