floridakeys.noaa.gov · Official Tourism
Official sanctuary history showing French Reef mooring-buoy protection and no-take context.
Classic Key Largo reef with swim-throughs and protected water.
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French Reef is a sanctuary-protected offshore reef off Key Largo, known for winding channels, swim-throughs, and coral tunnels. It suits divers who want an immersive reef layout and good photo opportunities, but the maze-like structure rewards careful navigation. The site is also a good snorkel option when conditions are calm, and its sheltered setting means very still water can flatten visibility.
Conservative baseline from public research. No community dives logged yet.
Depth range, seasonality, and planning context.
Reported Depth
4.6m - 12.2m
Depth Note
Depth range given as about 15–40 ft.
Best Season
Year-round, with spring and early summer usually the easiest windows for warm water and clearer days.
Typical Conditions
Shallow reef sections with channels, swim-throughs, and a protected-water profile. Very still water can flatten visibility.
Hazards, restrictions, and access requirements.
Key Hazards
Safety Notes
Treat swim-throughs and caves as overhead sections and keep close track of direction in the reef maze.
Access Restrictions
Use the marked moorings and do not anchor on the reef; follow sanctuary rules and avoid touching or collecting marine life.
Legal Notes
French Reef sits inside a Sanctuary Preservation Area, so no-take rules apply and mooring buoys are used to protect the reef.
Community notes to help plan your visit.
Scuba Diving
Shallow reef dive with channels and multiple swim-throughs; strong situational awareness helps because the layout can feel maze-like.
Freediving
Not the primary use here; the channel network and overhead sections make scuba the safer, more natural fit.
Snorkeling
Snorkeling is workable in calm weather, especially for surface exploration around the reef edges and channels.
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at French Reef.
Directional shelter context for incoming swell.
Species commonly reported at this site, with direct links into their wildlife guides.
Community dive logs and visit reports for this site.
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Average conditions based on logged dives & visits.
Planning answers for access, conditions, timing, and site logistics.
Last Updated
Research Sources
Official sanctuary history showing French Reef mooring-buoy protection and no-take context.
Local operator page with Key Largo visibility and seasonal condition guidance.
Local dive-site listing with depth band and marine-life summary.
Operator note on swim-throughs, current protection, and visibility tradeoffs.
Official Key Largo visitor page for seasonality, access, and general conditions.
Know this site? Improve Spot Details.
French Twist: shallow Key Largo reef with swim-throughs.
Protected Key Largo swim-through with a star coral crown.
Advanced Key Largo wreck with strong current and rich fish life.
Shallow Key Largo wreck dive off French Reef