Sombrero Reef

Sombrero Reef is a shallow spur-and-groove coral reef in the Middle Keys, marked by the historic Sombrero Key Lighthouse. The site features expansive hard- and soft-coral formations, scattered sand channels and a natural eight-foot limestone arch called "The Arch" that provides a swim-through; it is widely regarded as one of the most popular, frequently dived sites in the Middle Keys and is accessible to snorkelers and entry-level divers. Dives are typically boat entries using mooring buoys. Depths commonly range from about 5 to 30 feet, currents are generally mild, visibility is often good (commonly 30 to 100 feet in clear conditions), and water temperatures are usually in the 70s-80s °F. Typical routes follow the reef crest and spur-and-groove channels, with divers swimming north or south along the slope to observe the coral formations and marine life. Hazards include boat traffic in the buoy field and sharp coral; no overhead environments exist, and the site is straightforward for beginner and intermediate divers.