Blue Bay Marine Park

Overview

Blue Bay Marine Park, located on the south-eastern coast of Mauritius near Mahébourg, is widely regarded as the island's most well-preserved coral reef ecosystem. Gazetted as a marine park in 2000, the site benefits from strict environmental protections that have allowed its coral gardens to flourish while many other reefs around the world struggle. The park covers approximately 353 hectares of turquoise lagoon, sheltered by a natural barrier reef that keeps currents calm and visibility consistently excellent. Depths range from a shallow 3 metres near the beach to around 18 metres at the outer reef edges, making it an ideal destination for beginners, snorkellers, and experienced divers alike.

The lagoon is accessible by boat from the Blue Bay beach area, with most dive operators offering morning and afternoon excursions. The short boat ride of five to ten minutes means maximum time in the water, and the calm, clear conditions ensure a relaxed and enjoyable experience throughout the year.

Marine Life

Blue Bay Marine Park earns its reputation through sheer biodiversity. The reef hosts over 50 species of hard and soft corals, including impressive table corals, brain corals, and delicate staghorn formations that provide shelter for hundreds of species of reef fish. Divers regularly encounter:

• Green and hawksbill sea turtles – often seen resting on sandy patches or grazing on seagrass; encounters are frequent and relaxed thanks to the no-disturbance rules enforced in the park.
• Parrotfish – these vibrant fish are a constant presence, their crunching on coral audible underwater and their brilliant turquoise and pink hues adding to the reef's palette.
• Anemonefish (clownfish) – tucked within swaying anemones, these charismatic little fish are a favourite subject for underwater photographers.
• Moray eels – several species, including the giant moray and snowflake moray, lurk in crevices and coral heads, often peering curiously at passing divers.
• Butterflyfish, angelfish, and wrasse – schooling in their hundreds around coral bommies, adding constant colour and movement to every dive.
• Octopus and cuttlefish – master camouflage artists that reward patient, observant divers with stunning colour-change displays.

The seagrass beds within the lagoon also attract juvenile fish and feeding turtles, making even the shallower sections well worth exploring.

Dive Conditions

One of the greatest attributes of Blue Bay Marine Park is its consistently benign diving conditions. The natural lagoon is sheltered from open-ocean swell and wind by the barrier reef, meaning wave action is minimal even during rougher weather periods. There is virtually no current to contend with, allowing divers of all experience levels to focus entirely on the marine life around them. Visibility typically ranges from 15 to 25 metres, often exceeding 30 metres on the best days. Water temperatures remain warm throughout the year, ranging from approximately 24°C in August to 29°C in February, making a 3 mm wetsuit or even a shorty sufficient for most divers.

Best Season

Blue Bay Marine Park can be dived every month of the year, and is one of the few Mauritian dive sites that remains accessible and enjoyable even during the cyclone season (January to March), thanks to its protected lagoon position. The austral summer months of November through April bring the warmest water and vibrant reef activity, while the cooler winter months of June to September offer the clearest visibility and a slightly different cast of marine visitors. Essentially, there is no bad time to dive Blue Bay – simply plan around your travel and enjoy.

Tips for Divers

• Arrive early for morning dives to enjoy the reef at its most active and avoid the crowds of snorkellers and glass-bottom boat tourists who arrive mid-morning.
• Bring an underwater camera – the shallow, bright conditions are ideal for photography, and subjects like turtles and clownfish are easy to approach.
• Respect the marine park rules: do not touch corals, do not feed fish, and maintain good buoyancy to avoid accidental damage to the reef.
• Sunscreen is prohibited in the marine park to protect corals – use a rash vest or UV-protective clothing instead.
• Combine your dive with a snorkel session to explore the shallower coral gardens that are equally spectacular from the surface.