Green Rock

Surat Thani, Ko Phangan District, Nang Yuan, Southern Thailand, Thailandpinnacle28 m maxintermediate

Conditions & tides

Green RockNang Yuan

Fair · 3/5

conditions visualisation

Fair3/5

Some chop right now — best window today 7 AM–5 PM.

Wind13 kn E

Current~0.4 kn ESE · model

Swell

0.4 m · 4s · ESE

Water

30 °C

Max depth

28 m

Conditions through the day

6 AM6 PM

Calmest current near slack — 19.45 local

Sunrise 06.13 · Sunset 17.56 local

Show details

Tide · local

Outlook — select a day for full conditions

On-face swell 0.3 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

Green Rock is a dive site located near Koh Nang Yuan, off Koh Tao in the Gulf of Thailand, formed by large granite boulders that have calved from the island to create an extensive maze of swim-throughs, tunnels, narrow passages, canyons, and caverns across a broad area of seafloor.

The site reaches a shallowest point of around 4–5 metres at the main pinnacle and drops to a maximum of 28 metres, with bold, dramatic topography defined by the granite boulder formations and the overhead environments they create.

Marine life at Green Rock includes giant moray eels, blue-spotted stingrays, triggerfish, batfish, nudibranchs, turtles, sea snakes, and trevally, with nocturnal creatures also found sheltering inside the caves and swim-throughs.

Read the full guide

The site is best suited to divers with experience, with an Advanced Open Water certification recommended to explore all aspects of the dive; currents can at times be strong, the swim-throughs are narrow, and triggerfish become territorial during their breeding season (April–May), adding an additional hazard to be aware of. The ocean-facing side of the site is exposed.

AI-written site guide