Koh Bida Nai

Krabi, Koh Phi Phi, Southern Thailand, Thailandreef30 m maxintermediate

Conditions & tides

Koh Bida NaiKoh Phi Phi

Rough · 2/5

conditions visualisation

Rough2/5

Rough at the surface right now — best window today 7 AM–5 PM.

Wind16 kn ENE

Current~0.4 kn WNW · model

Swell

0.1 m · 7s · S

Water

30 °C

Max depth

30 m

Conditions through the day

6 AM6 PM

Calmest current near slack — 15:45 & 04:30 local

Sunrise 06:14 · Sunset 18:03 local

Show details

Tide · local

Outlook — select a day for full conditions

On-face swell 0.4 m — the component of the swell aimed at this site’s exposed face. Current is a regional model value (Copernicus, ~9 km grid) — a guide to the area, not a precise reef measurement. Imagery © Esri · not depth or visibility.

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 Bida Nai is the inner of the two Bida limestone islets that rise just south of Koh Phi Phi Leh in the Andaman Sea. It is the gentler of the pair, a reef and sloping wall that wraps the base of the rock.

The reef holds a lot of life for its size. Leopard sharks and blacktip reef sharks are seen on the sand and along the drop-off, hawksbill turtles graze the coral, and the nooks in the limestone shelter seahorses, ghost pipefish, moray eels and a good spread of nudibranchs for those diving slowly.

Koh Bida Nai is dived year round from Phi Phi and Phuket day boats and is often paired with its sister rock Koh Bida Nok.

AI-written site guide

Marine life here

Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.

StingrayStingrayReported here · unconfirmed
Reef sharkReef sharkReported here · unconfirmed
GlassfishGlassfishReported here · unconfirmed
Sea turtleSea turtleReported here · unconfirmed
ScorpionfishScorpionfishReported here · unconfirmed
ButterflyfishButterflyfishReported here · unconfirmed
Moray eelMoray eelReported here · unconfirmed
SeahorseSeahorseConfirmed present · 3 independent sources
NudibranchNudibranchConfirmed present · 3 independent sources
Leopard / zebra sharkLeopard / zebra sharkConfirmed present · 6 independent sources
TrevallyTrevallyConfirmed present · 2 independent sources
OctopusOctopusConfirmed present · 2 independent sources
MackerelMackerelReported here · unconfirmed
AngelfishAngelfishReported here · unconfirmed
PipefishPipefishReported here · unconfirmed
Ornate ghost pipefishOrnate ghost pipefishReported here · unconfirmed
SnapperSnapperConfirmed present · 3 independent sources
BarracudaBarracudaConfirmed present · 3 independent sources
ClownfishClownfishConfirmed present · 4 independent sources
Ocellaris AnemonefishAmphiprion ocellarisReported here · unconfirmed
Long-spined Crown-of-ThornsAcanthaster planciReported here · unconfirmed
Magnificent Sea AnemoneRadianthus magnificaReported here · unconfirmed
Clark's AnemonefishAmphiprion clarkiiReported here · unconfirmed
Banded Sea UrchinEchinothrix calamarisReported here · unconfirmed
Blue LinckiaLinckia laevigataReported here · unconfirmed
Graeffe's Sea CucumberPearsonothuria graeffeiReported here · unconfirmed
Swarthy ParrotfishScarus nigerReported here · unconfirmed
Blackspotted PufferArothron nigropunctatusReported here · unconfirmed
Whale SharkRhincodon typusReported here · unconfirmed
FrogfishFrogfishReported here · unconfirmed
TriggerfishTriggerfishReported here · unconfirmed
Moorish IdolZanclus cornutusObserved near here · iNaturalist
Indo-Pacific Sergeant MajorAbudefduf vaigiensisObserved near here · iNaturalist
Moon WrasseThalassoma lunareObserved near here · iNaturalist