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Richelieu Rock

Andaman Sea, Thailand · 8–35m · intermediate · exposed

Horseshoe pinnacle packed with life from seahorses to whale sharks — Thailand's best dive site.

Conditions today

Retrieved · refreshed hourly

poor

Poor — 0.8m effective waves made worse by short-period chop.

Limiting factor: period

Wave height
0.8–1.1m
Wave period
5–7s
Wind chop
0.3–1m
Sea temp
29–29.1°C

Ranges span today's hours. Wave height here is the raw sea state — the rating scales it for how exposed the site is. Exposed — open water with nothing to block the swell, so it is scored at full height.

Next few days

  • TodayPoor — 0.8m effective waves made worse by short-period chop.poor
  • SundayPoor — 1.2m effective waves made worse by short-period chop.poor
  • MondayPoor — 1.2m effective waves made worse by short-period chop.poor

Each day is scored over its morning dive window, the same as today's rating.

Dive briefing

AI-generated

Conditions are poor today, hampered by short-period chop. Raw wave heights are running 0.8 to 1.1 metres with periods of five to seven seconds — choppy surface conditions that will make entry and exit challenging and work against you on the pinnacle. Water temperature sits at 29°C. This is an intermediate site with a maximum depth of 35 metres; you'll need to manage the rough conditions carefully to stay safe and in control on the exposed horseshoe.

Divers commonly log ocellaris anemonefish and moorish idols here, with swarthy and greenhead parrotfish, titan triggerfish, and blackspotted puffer frequently recorded. The reef holds life across all depth zones. Today's chop means you'll earn your bottom time, but the site's reputation for abundance remains solid. Consider whether conditions suit your comfort level before committing.

Written by Claude (claude-haiku-4-5-20251001) from the rating, forecast, and sightings on this page — it has no other source and cannot look anything up. Treat it as a summary, not as local knowledge.

Commonly seen here

Most-recorded species near this site, ranked by research-grade iNaturalist sightings from divers, snorkelers, and naturalists.

Species come from iNaturalist — research-grade sightings logged by divers, snorkelers, and naturalists nearby. The ranking reflects what people photograph most, not guaranteed abundance. Ask a local operator what's actually being seen. Species names link to iNaturalist for range maps, seasonality and more photos. Photos by iNaturalist contributors under Creative Commons licences — individual credit on hover.