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Boat access, visibility, and lee-side shelter.
Dive Spot Guide•
Flat Cay
Flat Cay is a shallow Caribbean reef dive.
Boat-access reef dive with coral ledges, sandy gaps, and easy snorkel-friendly structure on the lee side of the cay.
About Flat Cay
Flat Cay is a boat-access reef off St. Thomas where coral ledges, sandy cuts, and scattered sponges make a clean loop for easy reef diving. The site stays open and readable, so you can move from patchy coral heads to shallow structure without losing the group or the reef line. It is a good fit for snorkelers, new divers, and relaxed teams because the structure is simple, the marine life is busy, and the lee-side placement usually keeps the dive calm.
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Research Estimate At Flat Cay
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 17m
AccessModerate entry effort
CoralHealthy coral
Aquatic LifeExceptional variety
FacilitiesBasic facilities
Crowd / PopularityModerate
CurrentNo current
SurgeLight surge
Where Is Flat Cay?
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Community sourced coordinates.
Flat Cay Planning Details
Depth range, seasonality, and planning context.
Reported Depth
5m - 20m
Depth Note
Depths are reported from about 17 ft to 70 ft, with a shallow reef profile suitable for new divers and snorkelers.
Best Season
Year-round, with lee-side conditions making sheltered days the easiest.
Typical Conditions
Clear tropical reef water with hard corals, sponges, sandy gaps, and a shallow-to-moderate profile.
Safety & Access At Flat Cay
Hazards, restrictions, and access requirements.
Key Hazards
Surge
Safety Notes
Keep buoyancy tight over the coral, watch the ledges for surge, and maintain a relaxed pace on the reef line.
Access Restrictions
Access is by boat, so plan around the operator's drop-off and pickup windows.
Legal Notes
The site is an offshore reef, so follow boating rules and operator guidance for the drop-off.
Local Intel For Flat Cay
Community notes to help plan your visit.
Scuba Diving
The ledges, sandy gaps, and coral growth make this a straightforward Caribbean reef dive with plenty to look at.
Freediving
The shallow reef structure can work for relaxed freedive sessions, but buoyancy and reef awareness still matter on the ledges.
Snorkeling
The site is snorkel-friendly because the reef sits shallow and the structure stays easy to read from the surface.
Chill / Non-diver
A relaxed reef session fits here well because the site is colorful, open, and easy to follow.
Wildlife at Flat Cay
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At Flat Cay
Community dive logs and visit reports for this site.
Dive Spot Log Averages At Flat Cay
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility17m
Activity
No dive activity logged yet.
