Ari Atoll

Ari Atoll (officially Alifu Alifu and Alifu Dhaalu Atolls) forms the western chain of the central Maldives, lying roughly 80 km west of Malé. The tidal regime is mixed with a pronounced diurnal component; spring range is approximately 0.9–1.2 m above Chart Datum, and on some lunar phases the tidal pattern becomes predominantly diurnal — one high and one low per day. The Maldivian tidal cycle is also characterised by a clear diurnal inequality: the two daily highs regularly differ by 0.2–0.4 m. Ari Atoll divides naturally into North Ari Atoll and South Ari Atoll, separated by a deep ocean channel. The atoll rim consists of faros (ring-shaped reef structures) and thilas (submerged reef pinnacles); the passes between them generate the tidal current that structures the dive ecology. During an outgoing tide from the atoll lagoon, plankton-rich water flows seaward through the passes; reef fish concentrate at the pass entrance to feed, and larger pelagic species follow. The whale shark (Rhincodon typus) aggregations along the eastern ocean face of South Ari Atoll — among the most reliably accessible in the world — are driven by the upwelling pattern tied to the SW monsoon (May–November); the animals feed at the surface on fish spawn and zooplankton that the current brings into the photic zone. Rangali Island, in the far southwest of the atoll, is the site of a luxury resort positioned on two islands connected by a 500 m walkway over the lagoon; the house reef drops to 30 m within metres of the beach. Maamigili, in the northeast, has the only domestic airport in the atoll and serves as the main non-resort access point. Dhidhoofinolhu is a resort island in the northern section of the atoll with a long house reef on the ocean face. The Maldives Meteorological Service operates the national sea-level gauge network. Predictions here come from Open-Meteo Marine: accuracy ±45 min / ±0.2–0.3 m.