Twins
Conditions & tides
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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
Twins is a shallow rock formation dive site located between the three adjoining islands of Koh Nang Yuan, off Koh Tao, Thailand. The site is made up of two main rock formations and a smaller, deeper offshoot, with boulders ranging from 5 m to 18 m depth. The rocks are set into white sandy patches, and the terrain is calm and protected, making Twins one of Koh Tao's most popular sites and well suited to beginner divers and Open Water training dives.
The sandy areas between the three pinnacles are home to hundreds of shrimp gobies and their blind shrimp partners, a symbiosis easily observed at close range. Regular sightings include saddleback clownfish (anemonefish), blue-spotted stingrays, blue-ringed angelfish, six-barred angelfish, gobies, grouper, white-eyed moray eels, yellow boxfish, titan triggerfish, wrasses, and yellow raccoon butterflyfish. A resident pair of saddleback clownfish occupies an anemone protected by a ring of stones.
Conditions at Twins are sheltered and accessible year-round, with water temperatures between 27 and 30°C and light currents. Visibility is generally good. The maximum depth of 18.5 m and calm nature of the site place it firmly in beginner territory, with no experience beyond Open Water level required.
Marine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
StingrayStingrayConfirmed present · 2 independent sources
Sea turtleSea turtleReported here · unconfirmed
Moray eelMoray eelReported here · unconfirmed
Hong Kong ButterflyfishChaetodon wiebeliReported here · unconfirmed
Redbreast Maori WrasseCheilinus fasciatusReported here · unconfirmed
Slingjaw WrasseEpibulus insidiatorReported here · unconfirmed
Scissortail SergeantAbudefduf sexfasciatusReported here · unconfirmed
Titan TriggerfishBalistoides viridescensReported here · unconfirmed
PipefishPipefishConfirmed present · 2 independent sources
NudibranchNudibranchConfirmed present · 3 independent sources
TriggerfishTriggerfishConfirmed present · 3 independent sources
ScorpionfishScorpionfishReported here · unconfirmed
BarracudaBarracudaReported here · unconfirmed
Ghost pipefishGhost pipefishReported here · unconfirmed
FusilierFusilierReported here · unconfirmed
PufferfishPufferfishReported here · unconfirmed
AngelfishAngelfishConfirmed present · 4 independent sources
WrasseWrasseConfirmed present · 2 independent sources
GrouperGrouperConfirmed present · 3 independent sources
SnapperSnapperReported here · unconfirmed
ClownfishClownfishConfirmed present · 9 independent sources
Blue-barred ParrotfishScarus ghobbanReported here · unconfirmed
Doublebar RabbitfishSiganus virgatusReported here · unconfirmed
Pink Skunk AnemonefishAmphiprion perideraionReported here · unconfirmed
Blackeye ThicklipHemigymnus melapterusReported here · unconfirmed
Longfin BannerfishHeniochus acuminatusReported here · unconfirmed
ParrotfishParrotfishConfirmed present · 2 independent sources
Mourning DoridJorunna funebrisObserved near here · iNaturalist
Surf ParrotfishScarus rivulatusObserved near here · iNaturalist
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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