Sombrero Reef
Sombrero Reef, FL
Sombrero Reef is part of the Sombrero Key Sanctuary Preservation Area and the greater Florida Reef, the world’s third-largest barrier reef ecosystem. It’s a spur-and-groove reef formation and one of the most popular snorkeling spots in the Florida Keys. Restoration efforts are underway to protect and preserve this delicate ecosystem.
The basics
Nearly a dozen mooring buoys are on the south side of the Sombrero Reef Lighthouse, which makes it a convenient place to snorkel when you book a guided boating or kayak tour. Diverse marine life swims around the reef so you may see anything from grouper and snapper to nurse sharks, stingrays, and sea turtles. Many visitors rent kayaks on the island or take a paddling tour of the 10-mile (16-kilometer) loop around the lighthouse by launching from Sombrero Beach on Marathon Island.
Things to know before you go
Fishing and lobstering are not allowed.
You cannot stand or climb on the Sombrero Lighthouse.
Thunderstorms can reduce water clarity and marine life presence.
How to get there
Sombrero Reef is beneath the water so the only way to access it is by boat. You can see some of it from the boat, but for the best views, snorkeling or scuba diving is necessary. If you don’t have a boat, tour companies launching from Marathon Island offer tours to Sombrero Reef, five nautical miles (nine nautical kilometers) south of Pigeon Key.
When to get there
Typically, the best time to snorkel in the Florida Keys is June–August. The warm water and strong sunlight create optimal conditions to view Sombrero Reef. However, this is also the hottest time of year in Florida, so you may want to plan an early morning visit to explore the reef while minimizing the risk of sunburn and dehydration.
Other things to see off of Marathon
Marathon is a popular stopping point for people driving the Overseas Highway to Key West. Not only does the island have plenty of things to eat and do, but it’s also home to other landmark attractions such as the new and old Seven Mile Bridges. You can walk or bike the Old Seven Mile Bridge to Pigeon Key where there's a small museum.
Travel Like an Expert with AAA and Trip Canvas
Get Ideas from the Pros
As one of the largest travel agencies in North America, we have a wealth of recommendations to share! Browse our articles and videos for inspiration, or dive right in with preplanned AAA Road Trips, cruises and vacation tours.
Build and Research Your Options
Save and organize every aspect of your trip including cruises, hotels, activities, transportation and more. Book hotels confidently using our AAA Diamond Designations and verified reviews.
Book Everything in One Place
From cruises to day tours, buy all parts of your vacation in one transaction, or work with our nationwide network of AAA Travel Agents to secure the trip of your dreams!