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Scuba diving at Sombrero Reef in Middle Keys
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Sombrero Reef

GOOD
Middle KeysBoat
About This Site
Sombrero Reef is a spectacular natural reef system marked by a historic lighthouse in the Florida Keys National Marine Sanctuary. Located off Marathon, this vibrant reef offers diverse coral formations, abundant marine life, and excellent visibility, making it one of the most popular dive destinations in the Middle Keys.

Difficulty

Beginner

Max Depth

15m

Type

Boat

Typical Visibility

18m

Conditions Summary

Best time today

4PM - 10PM

GREAT

Best day in forecast

Thursday

GREAT

2026-02-19

Community-reported visibility

n/a

Warnings for today

None

South-southeast facing reef off Marathon. The Keys block north and west swells completely, while east through south swells roll in at near-full strength. Spur-and-groove formations provide some wave attenuation at depth, but shallow reef tops get surgy during Atlantic swell events.

NNEESESSWWNW
Protected
Partially Exposed
Exposed
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