Top 10 Dive Sites in Mauritius
Mauritius is surrounded by a barrier reef that encloses a shallow lagoon on most sides of the island, creating a protected corridor of warm, clear water between beach and open ocean. Outside the lagoon, the seabed drops steeply — in places precipitously — into deep water, creating the dramatic topography that defines the island's best dives. The west coast, sheltered from the prevailing southeast trade winds, has the most consistent conditions and the highest concentration of dive operators. The east coast is wilder and less visited. Across both sides, the island's marine life includes sea turtles, moray eels, lionfish, and on the right day, large pelagics swept in on the deep-water currents. Water temperature sits between 22°C in the austral winter and 29°C in summer.
1. The Cathedral, Flic en Flac
The Cathedral is the most famous dive site in Mauritius and the one against which all others are judged. The site consists of a large underwater cave complex — technically more cavern than cave — at 24 to 28 metres on the west coast near Flic en Flac. The main chamber is big enough to accommodate a dozen divers simultaneously, with light filtering through two large openings that create shafts of blue-green illumination against the dark walls. Sleeping nurse sharks and white-tip reef sharks rest on the sandy floor. The approach and exit involve a swim along a coral reef from five to 30 metres. Advanced Open Water is the appropriate certification for the main chamber; the reef approach is suitable from Open Water level.
2. Stella Maru Wreck, Flic en Flac
The Stella Maru, a 55-metre Japanese fishing vessel deliberately sunk as an artificial reef in 1987, lies at 25 to 32 metres off the west coast near Flic en Flac and is now one of the region's most densely colonised wreck dives. The hull is entirely encrusted with soft corals, sponges, and hard coral growth. Schools of glass fish fill the interior in shimmering curtains; large grouper patrol the external hull. Penetration of the main hold is possible for divers with basic wreck training. The wreck is adjacent to a natural reef, so a single dive can combine wreck and reef. Advanced Open Water for the deeper sections; Open Water for the upper structure and reef.
3. Trou aux Biches Reef
On Mauritius's northwest coast, Trou aux Biches sits outside a gap in the barrier reef that channels oceanic water directly onto the adjacent coral structure, creating conditions that support some of the island's healthiest hard coral coverage. The dive runs from five to 22 metres along a sloping reef with impressive Acropora table formations in the shallower sections and more diverse coral types below 15 metres. Turtle encounters are almost routine. The gap in the barrier makes the site accessible from the shore; the village itself has several well-run PADI operators. Best dived October through April when the northwest coast is at its calmest.
4. Coin de Mire (Gunner's Quoin)
Coin de Mire is a small island off the northern tip of Mauritius, accessible only by boat. The island's protected status has allowed its underwater environment to recover well from past pressure, and the resulting diving — walls and bommies from eight to 35 metres — is among the most pristine around Mauritius. Large Napoleon wrasse, schools of barracuda, and patrolling eagle rays are reliable encounters. The more exposed northwestern face of the island has strong current and dramatic topography; the eastern side is calmer and suited to Open Water divers. Day trips from the north coast take around 45 minutes. Not dived in strong northeast swells.
5. Whale Rock, West Coast
Whale Rock is a submerged pinnacle rising from around 30 metres to eight metres below the surface, exposed to open-water current and consistently visited by pelagic species. The name references the large rock formation's resemblance to a surfacing whale rather than actual whale sightings, though whale activity does occur in the offshore blue water during the austral winter season. The pinnacle itself supports a rich benthic community: sea fans, wire coral, and black coral create the structure; grouper, snapper, and trevally constitute the mobile population. Advanced Open Water minimum given the depth and current. Best when the current is running — that's when the pelagics appear.
6. Passe St Jacques, South Coast
The south coast of Mauritius receives less dive traffic than the west and offers correspondingly less-disturbed conditions. Passe St Jacques is a pass through the barrier reef near Mahebourg that delivers oceanic water onto a rich reef system at five to 25 metres. Rays, including stingrays and eagle rays, use the sandy channels adjacent to the reef. The pass creates a mild drift during tidal exchange. This is an underrated part of Mauritius for diving, combining accessible depths with a reduced-pressure environment. The south is more exposed to weather than the west, and diving here is generally limited to the October–April dry season.
7. The Kei Sei 113 Wreck, East Coast
On the east coast off Trou d'Eau Douce, the Kei Sei 113 is a 65-metre Taiwanese fishing vessel that sank in 1982 and now rests at 22 to 30 metres. The east coast sees far fewer visiting divers than the west, and the wreck consequently has a rawer, more exploratory feel. Schooling fish have colonised the structure in large numbers, and penetration of the hold and engine room reveals intact machinery under a cover of growth. The east coast is sheltered from May through November; from December through April, the southeast trades make the east coast the more accessible alternative to the rough west coast.
8. Passe de la Fougère, North
A second north coast pass, Passe de la Fougère provides a drift option for divers wanting to cover ground rather than focus on a single site. The pass delivers current from the Indian Ocean across a reef running from eight to 22 metres, with large schools of anthias and chromis overhead and solid hard coral below. The drift is consistent and manageable for competent Open Water divers. Stingrays are almost always present on the sandy sections, and the occasional hammerhead has been reported on the outer edge near the reef break. Best in the morning before the northeast breeze builds.
9. Blue Bay Marine Park, Southeast
Blue Bay, near Mahebourg, is the most protected marine area in Mauritius and the site of the island's best preserved coral garden in shallow water. The park covers just over eight square kilometres and depths range from one to 18 metres — this is a snorkelling and shallow reef dive destination rather than a wall or pelagic site, but its coral health and fish diversity are exceptional. Parrotfish, butterflyfish, and anemonefish in large numbers inhabit the garden, and turtles are consistently present. The site requires a permit entry fee. This is the best option for Open Water divers or those on a resort course.
10. Grand Baie Plateau, North Coast
Grand Baie, on Mauritius's northern tip, is the island's main tourist resort area and the base for the highest concentration of dive operators. The dive plateau off Grand Baie extends from five to 20 metres over mixed reef terrain, providing an accessible and well-serviced option for divers of all levels. The site lacks the dramatic topography of the Cathedral or Coin de Mire, but its proximity to infrastructure, reliable visibility, and strong fish populations — including consistent turtle encounters — make it a practical choice for those based in the north. Many operators run two-tank morning trips combining Grand Baie with Coin de Mire.
Planning Your Mauritius Dive Trip
October through April is the general best period, coinciding with the austral summer and the northwest monsoon season when the west and north coasts see calmest conditions. May through September brings the southeast trade winds, which rough up the west but calm the east — a practical opportunity for those willing to cross the island. Water temperature peaks at 29°C in February and drops to around 22–23°C in August, when a 5mm wetsuit is genuinely welcome. Mauritius has a mature dive industry with numerous well-equipped operators; most large resort hotels have an in-house dive centre. Recompression facilities are available at Victoria Hospital in Port Louis. Open the map to navigate the full range of Mauritius dive sites across all four coasts.