Blue Bay Marine Park, near Mahebourg in south-east Mauritius, has been the island's only marine park since 1997 (a Ramsar wetland since 2008, roughly 353 hectares). Its shallow, sheltered lagoon opens straight off the sand, making it one of Mauritius's best shore snorkels for beginners and families. Around 50 coral species and more than 72 reef-fish species live here, and the southern zone holds a massive brain coral thought to be 800-1,000 years old and the largest in the Indian Ocean, sitting at about 4-5 m. Visibility runs 20-30 m and water sits at 23-28°C, with green and hawksbill turtles turning up on calm mornings. Note that recent surveys report roughly 40% coral loss across the park, so keeping fins and hands off the reef matters more than ever.
A brain coral believed to be 800-1,000 years old and about 5 m across — reputedly the Indian Ocean's largest — in the southern zone at 4-5 m
Over 72 reef-fish species and around 50 corals: clownfish, angelfish, butterflyfish, parrotfish, Moorish idols and triggerfish
Green and hawksbill turtles, best spotted 7-9 a.m., plus the occasional ray
A beach-entry northern zone just 1-2 m deep, ideal for beginners and families; denser coral gardens toward the centre
Glass-bottom boats for non-swimmers, while the protected core reef is reached only on licensed guided boat tours
Good to know
SafetyEven on calm-looking days there are moderate currents, and near the rocky point at the southern edge the water can pull you toward the reef pass and the open sea. Don't cross beyond the marked rocky point, stay inside the lagoon, carry a float or buoy, and never snorkel alone.
SafetyGlass-bottom boats, tour boats and jet-skis cross the bay throughout the day. Keep to the shallow shore zones, look around each time you surface, and use a brightly coloured float or tow buoy so boats can see you.
SafetySea urchins, fire coral, stingrays and moray eels are present. Wear water shoes, don't put your feet down on the reef, and keep hands out of crevices — even brushing fire coral leaves a burning sting.
SafetyThe easy northern shallows can lull beginners into overconfidence. Mask fogging, breathing panic and fatigue are common, and long immersion chills you even in warm water. Rest often, don't drift far offshore, and keep children within arm's reach at all times.
RulesPark rules forbid touching or standing on coral and all fishing or collecting, with fines up to Rs 50,000. Use reef-safe mineral sunscreen (zinc/titanium), and enter the core reef only on a licensed guided boat tour.
MannersStay at least 3 m from turtles and never chase or feed wildlife. Don't stand on living coral — around 40% of the park's coral has already been lost.
SeasonSnorkelling is possible year-round but conditions shift. November-April (Southern-Hemisphere summer, high season) brings warmer water but cyclone risk peaking Jan-March; May-October is drier and calmer yet cooler and can be windy from the south-east trades. Aim for 7-10 a.m., when the water is calmest and turtle sightings are best.
Practical info
Blue Bay is about a 15-minute drive from SSR International Airport and 10 minutes from Mahebourg, with free beach access and free parking. You can wade straight into the shallow lagoon from the sand, but the protected coral gardens and the ancient brain coral are best reached on licensed guided boat or glass-bottom boat tours departing from Mahebourg and Blue Bay. Prices, timetables and departure conditions vary with the weather, so confirm the latest details with local operators just before you go.
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