Molasses Reef
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily — treat everything here as planning ranges.
Molasses is the workhorse of Key Largo diving and arguably the most-visited reef in the hemisphere, which says something about how much life it still carries. Spur-and-groove coral ridges run seaward in orderly ranks, each groove a sand boulevard trafficked by southern stingrays and nurse sharks, each spur topped with sea fans, grunts in curtains, and the parrotfish crunch that becomes the dive's soundtrack. Turtles pass with the indifference of long habituation, barracuda hold station under boats, and the old winch from a grounded cargo vessel marks the site's best-known corner. Mooring buoys, shallow profiles, and dependable clarity make it the Keys' default answer to almost any conditions question.
The moment you come for: Textbook spur-and-groove, dense fish schools, turtles and rays on nearly every dive
Topography: Classic spur-and-groove coral ridges over sand channels
Current: The Gulf Stream's inner edge brushes the reef; drift gently along the spurs when it does.
Know before you splash
Hazards: Boat traffic on busy days; mild current on the outer spurs.
Conservation: A Sanctuary Preservation Area: no fishing, no touching, mooring buoys mandatory.
Who you'll meet
Great Barracuda
Green Sea Turtle
Hawksbill Turtle
Nurse Shark
Southern Stingray
Spotted Eagle Ray
For photographers
Wide angle: ★★★★☆ · Macro: ★★★☆☆ — editors' 1–5 rating of what this site gives each style of shooting