Part 18 of 20
The Mesoamerican Reef: the jewel of the Caribbean
Stretching over 1,000 km from Mexico to Honduras, the Mesoamerican Reef is the largest reef system in the Atlantic, with whale sharks, manatees and four countries to explore.
The Mesoamerican Reef, sometimes called the Great Mayan Reef, runs for over 1,000 km from Isla Contoy at the tip of Mexico’s Yucatán Peninsula, along Belize and Guatemala, to the Bay Islands of Honduras. It is the second-largest reef system in the world after the Great Barrier Reef and the largest in the Atlantic Ocean.
Why it’s special
The reef supports more than 500 species of fish, nesting turtles and one of the world’s largest populations of West Indian manatees, estimated at 1,000 to 1,500 animals. Whale sharks gather each year off Isla Mujeres and Holbox in Mexico, at Gladden Spit in Belize and around Utila in Honduras. Its many protected areas include Cozumel Reefs National Park, Hol Chan Marine Reserve, the Belize Barrier Reef Reserve System and the Sian Ka’an biosphere reserve.
The reef today
The reef is under pressure from coastal development, run-off, overfishing, stony coral tissue loss disease and rising temperatures. The 2023–25 heatwave caused severe bleaching: one monitored reef in Honduras fell from about 46% live coral to 5% within months. The four countries cooperate on reef management, and restoration projects are under way across the region.
Where to go
- Mexico: Cozumel’s Palancar Reef, the cenotes and reefs of the Riviera Maya, and whale sharks off Isla Mujeres (June to September).
- Belize: the barrier reef, atolls and the Great Blue Hole.
- Honduras: the Bay Islands of Roatán and Utila, popular for affordable dive courses and wall diving.
When to go
The dry season, roughly December to May, is best across most of the region. Hurricane season runs from June to November. Whale shark seasons vary by site.
Snorkelling or diving?
Almost every part of the reef offers great snorkelling. In Mexico, the reefs off Puerto Morelos and Akumal are easy to reach from the beach, and swimming with whale sharks off Isla Mujeres is a summer highlight. In Belize, Hol Chan is the classic snorkel trip, and Honduras’s Bay Islands have reefs right off the beach at West End and West Bay on Roatán. Divers can choose between drift dives in Cozumel, walls and atolls in Belize, and affordable dive courses in Utila and Roatán.
Know before you go
- Several countries, different rules: each country and marine park has its own fees and regulations.
- Sargassum: mats of seaweed wash ashore on some Caribbean coasts, especially from spring to autumn, so check before booking a beach stay.
- Sunscreen: biodegradable sunscreen is required in Mexican marine parks.
- Water temperature: 26–29°C.
- Whale sharks: choose operators that follow responsible-encounter guidelines.
Protecting the reef
Pay marine park fees, use biodegradable sunscreen, and choose operators that use moorings. Avoid buying souvenirs made from coral, turtle shell or shells.
Book a trip
Compare snorkel trips, dive days and tours for this area on our partner GetYourGuide, with reviews from other travellers and free cancellation on many trips. For the full list, see the world’s top 20 coral reefs, or read about coral bleaching and the future of reefs.
Questions people ask
How long is the Mesoamerican Reef?
Over 1,000 km (700 miles), from Isla Contoy in Mexico to the Bay Islands of Honduras.
Where can you swim with whale sharks on the Mesoamerican Reef?
Off Isla Mujeres and Holbox in Mexico (summer), at Gladden Spit in Belize (spring) and around Utila in Honduras.
Some links on this page earn us a commission at no extra cost to you. How this site makes money
