Richelieu Rock

Thailand18 m maxbeginner

Conditions & tides

Richelieu RockThailand

Fair · 4/5

conditions visualisation

Fair4/5

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

Wind7 kn E

Current~0.3 kn NNE · model

Swell

0.2 m · 6s · NNE

Water

31 °C

Max depth

18 m

Conditions through the day

6 AM6 PM

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

Sunrise 06:19 · Sunset 18:04 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

Richelieu Rock is a horseshoe of limestone pinnacles in the Surin Islands, 14 kilometres east of Koh Surin Nua, which looks like a croissant from above. The shallower southern side contrasts with a deeper northern section that drops to about 30 metres, and scattered pinnacles surround the main rock over a bottom of rubble and sand. At low tide the rock peaks about a metre above the surface, and at high tide it disappears.

Tigertail seahorses, ornate ghost pipefish and harlequin shrimp live in the limestone cracks and caves, while huge schools of barracuda, giant trevally, rainbow runners and long-nose emperor fish gather around the pinnacles. Soft corals and anemones cover the rock in colour. Whale sharks are an occasional visitor, mostly from February to mid-May.

The currents run from weak to strong and the structure is complex in three dimensions, so the site calls for intermediate to advanced skills.

AI-written site guide