Three Trees

Phang Nga, Similan Islands, Bangu Island, Southern Thailand, Thailandreef30 m maxbeginner

Conditions & tides

Three TreesBangu Island

Good · 5/5

conditions visualisation

Good5/5

Calm and diveable right now — best window today 7 AM–5 PM.

Wind7 kn ENE

Current~0.6 kn N · model

Swell

0.2 m · 7s · S

Water

31 °C

Max depth

30 m

Conditions through the day

6 AM6 PM

Calmest current near slack — 15:30 & 04:00 local

Sunrise 06:20 · Sunset 18:06 local

Show details

Tide · local

Outlook — select a day for full conditions

On-face swell 0.2 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

Three Trees is a reef dive site on Similan Island 9, within Similan National Park, built around three enormous granite boulders that define its structure and name. The boulders sit at 22 m depth, their surfaces encrusted with hard and soft corals and sea fans, and the sandy bottom drops beyond 30 m from that point. A famous giant barrel sponge grows among the boulders and adds to their bulk each season. A shallow fringing coral reef extends from 7 m to 15 m, creating a natural two-part dive that moves between the deeper boulder terrain and the shallower reef above.

The site holds a strong variety of marine life across its different zones. Schools of barracuda and tuna patrol the open water, hawksbill turtles and rays pass through regularly, and Kuhl's stingrays rest on the sandy bottom. Andaman jawfish occupy the sandy areas between boulders, and nudibranchs are found on the coral bommies. The site suits both wide-angle and macro photography.

The shallow reef between 7 m and 15 m offers good drift diving when current is running, while the deeper section around the boulders rewards a more methodical exploration. Currents range from weak to strong, water temperature runs 25–26°C, and visibility is generally great. The range of depths and light currents on most visits makes Three Trees accessible to all certification levels, from beginners to experienced divers.

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