Passikudah shallow bay barrier reef: Acropora micro-atolls and safe boat corridors?
How does the 150-meter-wide outer coral barrier at Passikudah Bay create a tranquil swimming lagoon, and what navigational markers protect living micro-atolls?
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3 Answers from travellers
Passikudah Bay features one of the longest calm shallow water zones in the Indian Ocean, protected by an outer fringing barrier reef. The reef crest absorbs open oceanic swells from the Bay of Bengal, dissipating wave energy. Behind this barrier lies a protected, sandy-bottom lagoon stretching over 150 meters seaward with depths under 1.5 meters. Within the lagoon, Porites and Acropora corals grow as flat-topped "micro-atolls", where vertical colony growth is halted by air exposure at extreme low spring tides. Motorized water sports are confined strictly to marked deep-water channels.
Swimmers can wade hundreds of meters offshore on calm mornings between May and September, but stepping onto micro-atoll crests crushes delicate living coral polyps.
The northern outer edge of the reef shelf generates a fast, shallow right-hand surf wave on heavy eastern groundswells, accessible by paddling across the lagoon.
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