Cave diving in Provence
The submarine karst rivers of Cassis — Port-Miou (to -233 m, with permission only) and the Bestouan (3.75 km, shore dive) — plus sea caves in the Calanques, around Riou and Maïre and at La Ciotat; the Fontaine de Vaucluse and the Cosquer cave are closed.
8 sites · down to 315 m · 4 suitable for an intro team
All 8 sites
| Site | Max depth | Type | Certification |
|---|---|---|---|
| Grotte à Corail (Île Maïre) | 25 m | Backmount | Open water / no overhead |
| Grotte à corail de Riou (Impériaux) | 45 m | Not known yet | Cavern |
| Grotte à Pérès | 25 m | Backmount | Open water / no overhead |
| Grotte Cosquer⛔ Closed to divers | 37 m | Sidemount | Full cave |
| Fontaine de Vaucluse⛔ Closed to divers | 315 m | Backmount | Full cave |
| Grotte des 3 Pépés (3PP) | 28 m | Not known yet | Intro to cave |
| Source du Bestouan | 33 m | Sidemount | Full cave |
| Exsurgence de Port-Miou | 233 m | Backmount | Full cave |
Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training.
Practical info: rules, fills and emergency numbers
Emergencies
- 112; at sea CROSS MED on 196 or VHF channel 16; DAN Europe +39 06 4211 5685.
- Hyperbaric chambers (24/7 on call): Marseille – AP-HM Hôpital Sainte-Marguerite, hyperbaric medicine, 270 Bd Sainte-Marguerite, 13009 Marseille, chamber +33 4 91 74 49 96. Toulon – HIA Sainte-Anne (SMHEP), 2 Bd Sainte-Anne, 83800 Toulon, +33 4 83 16 21 82. Call 112 or the CROSS first, and DAN.
Access and rules
- Port-Miou: the calanque is a municipal mooring zone of Cassis (harbour office +33 4 42 01 96 24, VHF 9); fishing, spearfishing and anchoring have been banned there since 2004. The river, well and dam are reserved for research and exploration — arrange permission in advance. FFESSM Provence holds supervised discovery days at Port-Miou and the Bestouan (FFESSM licence, level 2, 18+).
- Bestouan: shore dive from Bestouan beach, across a bathing zone and the harbour entrance — take a buoy and watch for boats. With an easterly wind there is swell on the entrance; the FFESSM picks mistral days, when this side is calm.
- Parc national des Calanques (since 2012; Frioul, Riou, Planier and 24 km of calanques): diving is allowed almost everywhere. Diving and anchoring are banned in the archaeological zones 'triangle Cousteau' (near Riou and Plane) and Pointe de la Voile at Cap Morgiou (Cosquer, 500 m radius). No-take zones (~10 % of the marine park, including the eastern half of the Riou archipelago): take nothing. Use the white ecological diver buoys; do not anchor on seagrass or coralligenous reef. In caves: do not let bubbles collect on the ceiling, no fin kicks, take nothing. Landing on Riou only by day, between the Fontagne and Monastério coves.
Gas and fills
- Gas: Technical Diving Academy (Salins d'Hyères) fills air, nitrox, trimix, O₂ and helium. Cassis Calanques Plongée and Plongée Tek Marseille (Pointe Rouge) work with trimix and CCR, Kraken Plongée (La Ciotat) with rEvo CCRs — ask about fills for visitors. CCR and scooter rental: ask.
Water and season
- Season: June–October; water ~14 °C early in the season to ~24 °C in midsummer, visibility up to 25 m; a 7 mm suit with hood is recommended. Below the thermocline it stays cold: at La Ciotat in summer ~23 °C above -17 m and ~13 °C between -18 and -28 m. Spring water: Bestouan ~15 °C, Port-Miou ~16 °C.
Getting around
- Sea caves are dived by boat with a centre from Marseille (Pointe Rouge), Cassis or La Ciotat; the ride to Riou's Impériaux takes ~25–30 min or more.
Rest day
- Rest day: the Cosquer Méditerranée replica in Marseille (open since June 2022) or the Fontaine-de-Vaucluse spring (access path partly closed since March 2024 because of rockfall).
Good to know
- Two kinds of diving: the submarine karst rivers of Cassis (Port-Miou, Bestouan) and sea caves in the Calanques, around Riou and Maïre and at La Ciotat. The Cosquer cave and the Fontaine de Vaucluse are closed to divers.
- Var coast (Toulon, Hyères, the islands): only small, well-lit caves, such as the Grotte Sainte-Marguerite off Le Pradet (-5 to -16 m, from level 1).
Plan a cave diving trip to Provence
Enter your team, with certifications, gas and configurations, and see right away which caves fit. With driving times from your stay, fill stations and an AI instructor who thinks along.
Compiled from web research (Parc national des Calanques, FFESSM/Subaqua 2013 and 2017, the Cassis – La Rivière Mystérieuse association, Wikipedia, Grottocenter/Grotto Map, Fontaine-de-Vaucluse commune, Préfecture maritime, DORIS, medsubhyp.fr, dive centres and dive-site databases; Sept 2026). Pins from the park page, Grottocenter or Wikipedia (see each site); four sites without a reliable pin; ~ = estimate. Rules change — check locally.