Not on any big group-tour itinerary: the sunken rocks around Hon Gam Ghi, where coral rises to the surface at low tide. Just ask your boatman for the “sunken rock reef”.
Around Hon Gam Ghi and Dam Ngang in the An Thoi archipelago lie very shallow sunken rock reefs. At low tide part of the coral rises to just below or above the surface – a rare sight that crowded group tours usually skip.
Why is it special?
- Coral and small fish right beneath you, clearly visible with just a mask.
- Few big boats, clear and quiet water.
- Spectacular aerial photos.
How to go and what to know
- Hire a private speedboat and ask the boatman for the “sunken rock reef” around Hon Gam Ghi; ask about low-tide times.
- Go in the dry season (roughly November – April) for calm, clear water.
- Never stand or step on coral; wear a life jacket and mask, and use reef-safe sunscreen.
- Watch out for sea urchins and sharp rocks; never break or take coral.
Reach Hon Gam Ghi on a tour
Marmoris – Morning Yacht Cruise and Marmoris Sunset Chilling both stop at Hon Gam Ghi for snorkelling and SUP; the morning trip of the South Island luxury yacht visits Hon Gam Ghi too. For a private trip to the sunken reef, message Blue Waves to arrange a speedboat.
Frequently asked questions
Where are the half-submerged coral reefs?
Around Hon Gam Ghi and Dam Ngang in the An Thoi archipelago, South Phu Quoc.
When does the coral show above the water?
At low tide, usually in the dry season; ask your boatman about tide times.
What should I know when snorkelling the reef?
Don’t step on or break coral; wear a life jacket, bring a mask and use reef-safe sunscreen.
