Baa Atoll

Baa Atoll (Maalhosmadulu Dhekunuburi) lies in the central Maldives, roughly 120 km northwest of Malé. It was designated a UNESCO Biosphere Reserve in 2011, the first in the Maldives, on the strength of its marine ecosystems. The defining event at Baa Atoll is the seasonal aggregation at Hanifaru Bay: between late May and November, on new and full moon tides, the combination of wind direction and tidal exchange concentrates zooplankton inside the small enclosed bay, drawing manta rays and whale sharks to feed in numbers unmatched anywhere else in the Indian Ocean. The UNESCO designation brought a management regime — snorkelling only inside the bay (no scuba), limited simultaneous visitor numbers. The rest of the atoll holds inhabited islands alongside resort islands, and the inter-island channels produce the tidal current conditions that big pelagics use throughout the year. The Indian Ocean tidal regime here is mixed semidiurnal, spring range 0.8 to 1.2 m — modest in height, but the channelled geometry of atolls concentrates the flow and produces currents that matter for divers and paddlers. Predictions come from Open-Meteo Marine (gridded model, ±45 min / ±0.2–0.3 m).