Koh Sak
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.
Dived here today? How were conditions vs. what we showed?
About this site
Koh Sak is a small island off Pattaya in Chonburi province, on the eastern Gulf of Thailand coast, close to the larger island of Koh Larn. Dive and snorkel boats from Pattaya's beaches reach it as part of short day trips around the local island group. The reef here tops out at around 12 metres, with light current and conditions suited to beginners. Nudibranchs and seahorses are a regular find on the reef, and divers have also reported angelfish, clownfish, damselfish, pipefish, and pufferfish around the site.
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.
Stichopus horrensReported here · unconfirmed
Bigeye SnapperLutjanus lutjanusReported here · unconfirmed
Copperband ButterflyfishChelmon rostratusReported here · unconfirmed
Spanish Flag SnapperLutjanus carponotatusReported here · unconfirmed
Brownstripe SnapperLutjanus vittaReported here · unconfirmed
Eightband ButterflyfishChaetodon octofasciatusReported here · unconfirmed
PufferfishPufferfishReported here · unconfirmed
AngelfishAngelfishReported here · unconfirmed
NudibranchNudibranchConfirmed present · 2 independent sources
SeahorseSeahorseConfirmed present · 2 independent sources
ClownfishClownfishReported here · unconfirmed
DamselfishDamselfishReported here · unconfirmed
PipefishPipefishReported here · unconfirmed
Durable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
No notes yet. Dived here? Be the first to leave a tip.
Share a write-up or a photo. Submissions are reviewed before they appear on the page.
Nearby dive sites
Shops that dive here
No shops have listed this site yet.