Mauritius
The lagoon island
A volcanic Indian Ocean island where the snorkeling is inside its lagoon — one old marine park, sheltered bays and a calm, wade-in shoreline.
A single high island in the western Indian Ocean, ringed by a shallow lagoon and by one of the region's older protected marine areas. The snorkeling here is lagoon and sheltered-bay water rather than a barrier reef: Blue Bay Marine Park carries the best coral, while Trou aux Biches, Flic en Flac and the Île aux Cerfs lagoon are easy, calm, wade-in mornings. Come for warm, clear, genuinely accessible water — and be clear-eyed that these reefs have taken warming hits too.