Coin de Mire

Grand Baie · Northern Islands · Mauritius

Coin de Mire is Mauritius diving at its most dramatic. This steep volcanic islet rises 150 metres above the sea approximately 8 kilometres north of the mainland, its sheer cliffs and wedge-shaped profile visible from beaches across the northern coast. Below the waterline, the volcanic topography continues in steep walls, natural arches, and caverns that host the best marine life in the Mauritius region, benefiting from clear oceanic water and current-delivered nutrients that the lagoon-protected mainland sites cannot match. The boat crossed open water from Grand Baie in twenty-five minutes, the islet growing from a distant silhouette into a formidable cliff face. We moored on the western side in the lee of the prevailing wind, and the water colour told the story immediately: deep blue fading to azure, with visibility exceeding 30 metres when I peered over the boat's edge. I descended along a volcanic wall that dropped from 5 metres to beyond recreational limits. The rock was dark basalt, perforated with holes and covered in encrusting organisms. At 15 metres, a natural arch perhaps 8 metres wide created a swim-through large enough for multiple divers. Sun shafts penetrated from above, illuminating schools of anthias that swarmed in the archway. On the other side, the wall continued its descent into blue-black depth. At 22 metres, a grey reef shark appeared along the wall edge, cruising south with measured strokes. It was followed at a distance by a second, then a third. Three sharks in loose procession along the deep wall. They showed awareness of our group but no alarm, maintaining their course with the confidence of apex predators in their home territory. Spotted eagle rays made two appearances during the dive, both times gliding past in the blue beyond the wall at 15 to 20 metres. A large school of barracuda circled above us during the safety stop, their silver bodies catching light in mesmerizing patterns. The shallower caverns on the southern side offered a different experience: dramatic light play in enclosed spaces, lobsters waving antennae from crevices, and scorpionfish perfectly camouflaged against volcanic rock. Coin de Mire is where Mauritius proves it can compete with the wider Indian Ocean for serious diving.