La Passe du Puits

Overview

Situated off the pristine coastline of Belle Mare on Mauritius's east coast, La Passe du Puits is a celebrated drift dive that stretches approximately 2 kilometres through a natural reef passage. The site takes its name from the French word for "well" or "shaft", a nod to the dramatic topography that channels ocean currents through its corridor. Depths range from a shallow 5 metres at the top of the reef to a more dramatic 30 metres at the outer channel floor, offering something for every level of intermediate diver. The east coast of Mauritius is far less developed than the north or west, lending La Passe du Puits a genuinely wild, frontier feel that sets it apart from the island's more trafficked dive sites.

The drift itself is the star of the show. As the current takes hold, divers are carried effortlessly along the reef wall, past coral gardens, crevices and open water drop-offs in a seamless, almost meditative flow. Boat tenders follow divers at the surface, making pick-up straightforward and allowing full immersion in the experience without navigation concerns. The sheer scale of the pass — combined with its consistent marine encounters — makes it one of the most rewarding dives on the entire island.

Marine Life

La Passe du Puits is a wildlife hotspot, and the cast of characters here is exceptional even by Mauritian standards. Highlights include:

• Eagle Rays: Spotted eagle rays are frequently seen soaring in formation through the blue water, their wingspans and graceful movement making them one of the most thrilling sights in Mauritian waters.
• Reef Sharks: Blacktip and whitetip reef sharks patrol the outer edges of the pass, particularly in the deeper sections near 20–30 metres. Their presence is a reliable indicator of the health of this reef ecosystem.
• Barracuda: Large schools of great barracuda are a common sight, often hovering in the current with their characteristic steely stillness before dispersing as divers approach.
• Green Turtles: Green and hawksbill turtles are resident in the area, resting on coral outcrops or feeding on sea grass. Encounters are frequent and often prolonged, as the turtles show little concern for passing divers.
• Reef Fish: The coral walls are alive with anthias, parrotfish, surgeonfish and triggerfish. Moray eels peer from crevices, and octopuses can occasionally be spotted tucked into rocky overhangs.

Conditions

La Passe du Puits carries a moderate current that is the engine of its rich marine life. The current strength can vary significantly with tidal cycles, and dive operators time their entries carefully to ensure an enjoyable rather than exhausting drift. The site is classed as intermediate — divers should be comfortable with open-water drift conditions, buoyancy control in moving water, and the ability to descend and ascend confidently without a fixed line. Visibility is typically excellent on the east coast, often reaching 20–30 metres in optimal conditions, though the site can be affected by cyclone swells or strong southeasterly trade winds, particularly between June and September.

Water temperatures range from around 23°C in winter (July–August) to 29°C in the summer months (December–March), making a 3mm wetsuit comfortable year-round for most divers.

Best Season

The best months to dive La Passe du Puits are November through May, coinciding with the warm summer season when the southeast trade winds ease and the east coast becomes more accessible. January, February and March offer peak conditions with warm water, excellent visibility and the greatest frequency of pelagic visitors. November and December are also outstanding, with building marine activity as the season swings into summer. April and May remain good options as the season transitions. The winter months of June through September bring trade winds and choppier seas to the east coast, making boat access more challenging and reducing visibility.

Tips for Diving La Passe du Puits

• Always dive with a reputable local operator who knows the tidal windows — timing your entry is crucial for an optimal drift experience.
• Carry a surface marker buoy (SMB) and know how to deploy it in a current; conditions here demand good drift-diving etiquette.
• Keep your buoyancy precise — scraping the reef not only damages coral but can also slow you in the current and disorient your position in the pass.
• Bring an underwater camera — the eagle ray and shark encounters here are among the most photogenic in Mauritius.
• Stay neutrally buoyant and let the current do the work; fighting it wastes air and energy on a dive best enjoyed in a relaxed, flowing state.