Critically EndangeredGiant Clam
Tridacna gigas
A horseshoe-shaped limestone pinnacle out in open water, with no island around it. It breaks the surface at low tide and is submerged at high. There are two further inner columns on either side of the central one.
Depth
5–35 m
Recommended level
Advanced Open Water
Average visibility
15 m
Mu Ko Surin National Park. The park is open only from 15 October to 15 May and may close earlier depending on sea conditions
The name comes from a Danish officer called Richelieu who served in the Royal Thai Navy. Cousteau is often credited with discovering and naming the site, but that version is disputed: Cousteau never went north of Koh Bon, which lies south of the Surin Islands. The Thai name is Hin Plo Naam.
Sources consulted: Wikipedia (Richelieu Rock); Thai National Parks; Dive Happy; SeaCrush; beunderwater.com; similandivingtours.com
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Same country: Thailand
Same country: Thailand
Same country: Thailand
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Water temperature
28 °C
Current
Strong
Access
Liveaboard
Best season
November-May
Recommended certification
Advanced Open Water
Approx. price
120 USD / dive
Same country: Thailand
Thailand