Conditions & tides
Scored by DiveConnect's site-physics model
Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.
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About this site
Arches is a reef dive site off Nosy Be, in the Diana region of northwest Madagascar, within the volcanic island group scattered through the Mozambique Channel. It is reached by boat from operators on Nosy Be or nearby islands such as Nosy Komba and Nosy Tanikely. The site is rated technical, and divers exploring it have reported angelfish, leaf scorpionfish, mackerel, nudibranchs, scorpionfish, triggerfish, and even whale sharks passing through.
AI overviewMarine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
MackerelMackerelReported here · unconfirmed
NudibranchNudibranchReported here · unconfirmed
Leaf scorpionfishLeaf scorpionfishReported here · unconfirmed
ScorpionfishScorpionfishReported here · unconfirmed
TriggerfishTriggerfishReported here · unconfirmed
Whale SharkRhincodon typusReported here · unconfirmed
Blue LinckiaLinckia laevigataReported here · unconfirmed
Green Sea TurtleChelonia mydasReported here · unconfirmed
Graeffe's Sea CucumberPearsonothuria graeffeiReported here · unconfirmed
Madagascar AnemonefishAmphiprion latifasciatusReported here · unconfirmed
Varicose Wart SlugPhyllidia varicosaReported here · unconfirmed
Spiny Cushion StarCulcita schmidelianaReported here · unconfirmed
Burrowing Fine Spine UrchinEchinostrephus molarisReported here · unconfirmed
Pacific TrumpetfishAulostomus chinensisReported here · unconfirmed
AngelfishAngelfishReported here · unconfirmed
Durable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
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