Located in Florida Keys, the snorkeling in Marathon Key offers more than a half-dozen beautiful snorkel dive spots. The best Marathon Key snorkeling based on popularity are considered to be Sombrero Beach, Sombrero Reef, Bahia Honda State Park, Coffins Patch, and Delta Shoals. For a detailed dive site description and printable snorkel dive map, just select a Marathon Key snorkeling dive below.
On the south side of Marathon Key, the snorkeling off Sombrero Beach is popular with local families. Within the designated swimming area, there are calm sea grass beds among the sand flats that are habitat for starfish, lobster and crabs. Plus, from April to October, the beach area is known for its hawksbill turtles. However, the water clarity is usually pretty poor unless it is super calm and windless for several days in a row. Even with clarity, there is usually not much to see. The best bet is to try snorkeling along the rocks at both ends of the beach during high tide, and you'll want to try March through September.
South of Marathon Key, the Sombrero Reef is by far the most popular snorkeling dive site in the Middle Keys. At this boat accessed site, there is a large spur and groove coral reef with star coral, brain coral and elkhorn coral. The snorkeling depth at Sombrero Reef ranges from 2 to 25 feet deep. While the snorkeling at Sombrero Reef is possible year-round, most snorkelers usually shoot for March through September. There are also some nice grassbeds that are perfect for beginner snorkelers to explore. During Sombrero Reef snorkeling, you may encounter baracuda and seargent majors among this 30 acre dive spot.