Located in the heart of the bay of Marseille, consists of two main islands, Pomègues and Ratonneau, and two satellite islands, the island of If and Tiboulen de Ratonneau. Despite a sharp decline in the last century, the Posidonia herbarium is well developed on Pomègues west coast. The coralligenous soils are predilection sites for diving around the Tiboulen Ratonneau and Cap Cavaux. The Frioul archipelago has about 10 dive sites, shared wrecks, breaks, and cliffs.
Planier island is located 8 miles nautical from Marseille Old Port, it houses the “lighthouse planier.” The reefs, barely submerged surrounding the island have been the cause of many shipwrecks. Many wrecks are present at this location and sumptuous dive sites. Among the wrecks we will mention those of Chaouen, of Dalton, the Latécoère and, less common, that of 1910. Messeschmitt dives sites are those of the ark Planier, the Stone Ring, the Garden, the Souquet, the Falling of the planner.