The Rocks Of Mongi, Djerba: Reef Diving and Drifts

The Rocks Of Mongi, often referred to as Mongi I and Mongi II, is a submerged reef system off Djerba, structured around distinct rock blocks set amidst sand and Posidonia seagrass beds. These formations create a complex underwater landscape, featuring numerous fault lines and small tunnels. This topography provides both shelter and hunting grounds for a variety of marine species, making it a focal point in the surrounding flatter seabed.

Your dive here will typically range between 10 and 16 metres, making it accessible while still offering a substantial bottom time. The rocky structures themselves are the main draw, forming natural refuges and swim-throughs that you can navigate. In certain sections, a small canyon, approximately 1,000 metres long, offers the possibility of a drift dive, allowing the current to guide you along its contours and observe the life concentrated there.

Life on the reef is active, with octopuses commonly found tucked into crevices and parrotfish grazing on the rocky surfaces. You’ll also spot groupers patrolling the larger rock formations and amberjacks moving in the blue. The site's numerous shelters mean you need to take your time to peer into the smaller openings, as moray eels often reside within these rocky retreats.

Beyond the prominent reef fish, keep an eye out for pearl oysters attached to the rocks and anthias schooling around the higher points of the formations. Rays are known to glide over the sandy patches between the rock blocks, and sea stars are common on the seabed. Flatfish, like flounders, camouflage themselves against the sand, blending into the environment, rewarding a slow and deliberate search.

While the site is primarily known for its resident reef inhabitants, occasional larger visitors such as turtles and dolphins are reported in the area. These encounters are less frequent but highlight the site's connection to the broader open water. The varied topology, from dense rock structures to open sand, creates a rich mosaic of habitats supporting this diversity.

What sets The Rocks Of Mongi apart from other sites in the vicinity is its combination of accessible depth and dynamic topography. Unlike purely sandy bottoms, the intricate rock formations here provide a concentrated habitat that draws in a greater density and variety of marine life. This makes it a site that feels more alive, offering more interactions than the surrounding flat areas.