The distinctive underwater sights worth planning around. Descriptions are curated planning info — always verify local access, rules and conditions before you set out.
01
Blue Bay Marine Park
Marine reserve📍 South-east coast, near Mahébourg
Mauritius' best-known protected reef: a sheltered bay off the south-east coast where coral heads, reef fish, seagrass and turtles sit in calm, shallow water inside a marine park. Glass-bottom boats and snorkel trips run from Blue Bay village, and the park's shelter makes it the island's most reliable snorkel day.
A marine-park fee and park rules apply, with anchoring and collecting regulated — confirm current fees and rules locally. The coral inside the park has been through warming events and is recovering rather than pristine.
02
Trou aux Biches
Shore reef📍 North-west coast
A long, sheltered north-west beach with coral patches, seagrass and reef fish a short swim out — the easiest genuinely good snorkel on the island from a wade-in entry, and a dive-school favourite for exactly that reason.
Boat and dive-school traffic shares this water, so stay inside the lagoon and watch for marked channels. Check the day's conditions and any local marker guidance before you swim.
03
Île aux Cerfs & the east-coast lagoon
Lagoon📍 Off Trou d'Eau Douce, east coast
The shallow lagoon around Île aux Cerfs is the postcard Mauritius: a day-boat hop from Trou d'Eau Douce to clear, calm water over sand and scattered coral, with a sheltered lee side when the south-east trades are up.
Honest framing: it is patchy coral rather than a dense reef, and the lagoon is busy with day boats. Pick an operator who keeps clear of the reef, and expect the water to cloud after heavy rain or runoff.
04
Flic en Flac lagoon
Lagoon📍 West coast
A long west-coast lagoon with easy shore entry straight off the beach, coral heads and good fish life close in, and a string of dive centres working it daily — the accessible, low-effort end of Mauritian snorkeling.
The reef flat is genuinely shallow in places, so keep your body and fins off the coral and watch the tide. Ask locally which entry point is clearest and calmest on the day.
05
Le Morne & the south-west coast
Shore reef📍 South-west, beneath Le Morne Brabant
The south-west coast under Le Morne's basalt peak: shallow reef and lagoon water on the calm days, with the peak's UNESCO-listed landscape above it. On the right day it is one of the most striking places on the island to get in the water.
Honest caveat: this is the island's wind-and-swell coast — Le Morne is a world kite-surfing spot — and the shallow reef flat can be exposed at low water. Pick the sheltered side, check the tide and the day's conditions, and treat local advice as final.