Top 10 Reefs in Belize
The Belize Barrier Reef Reserve System is a UNESCO World Heritage Site and the second-longest barrier reef in the world after Australia's Great Barrier Reef. Running 300 kilometres along the Caribbean coast of Belize, it is joined by three offshore atolls — Lighthouse Reef, Glover's Reef, and Turneffe Atoll — to form one of the most complete and varied reef ecosystems in the western Atlantic. Combined fish diversity, coral health on the outer atolls, and the accessibility of several sites to snorkelers make it Central America's most significant marine destination. All sites are on the interactive map.
1. Great Blue Hole, Lighthouse Reef Atoll
The Blue Hole is a marine sinkhole 300 metres across and 125 metres deep, formed during the last ice age when sea levels were lower. It is a barrier reef atoll at the outer edge of the Belize system and is primarily a wall and depth dive: the interior walls are colonised by stalactite formations and populated by Caribbean reef sharks Carcharhinus perezi, blacktip sharks, and the occasional hammerhead at depth. Coral diversity is lower in the deep interior than on surrounding atoll reef. Best for experienced divers. Best season: December to April.
2. Lighthouse Reef Atoll
The atoll that contains the Blue Hole is itself a world-class reef system. Half Moon Caye Wall, on the southeastern edge, is a sheer drop-off with dense soft coral growth and excellent visibility, and the island above is a protected booby nesting site managed by the Belize Audubon Society. Tarpon, hawksbill turtles Eretmochelys imbricata, and Nassau grouper Epinephelus striatus are resident. The fringing reef inside the atoll is accessible for snorkeling. Best season: November to April.
3. Half Moon Caye, Lighthouse Reef
The southern wall of Half Moon Caye combines a vertical drop with a sandy terrace at thirty metres that holds sleeping nurse sharks Ginglymostoma cirratum and eagle rays Aetobatus narinari. The island itself is a Natural Monument with a nesting colony of red-footed boobies visible from a viewing platform. Combining an atoll wall dive with wildlife watching above water makes this a genuinely all-round stop. Best season: January to May.
4. Glover's Reef Atoll
Glover's Reef is the most offshore of the three Belize atolls and one of the best-preserved reef systems in the Caribbean. A no-take marine reserve covers its southern section. The interior patch reef complex has dense hard coral cover and unusual fish density; the outer walls have shark and ray populations little affected by fishing pressure. Nassau grouper Epinephelus striatus still aggregate for spawning at specific moon phases in winter — an event nearly absent from heavily fished Caribbean reefs. Best season: December to March.
5. Turneffe Atoll
Turneffe is the largest atoll in Belize and the closest to Belize City, making it the most accessible for day trips. The Elbow, its southern tip, is one of the Caribbean's premier wall dives: a strong outgoing current sweeps divers along a wall colonised by black coral and large sea fans, with eagle rays, turtles, and Caribbean reef sharks routinely visible. The interior of the atoll has extensive mangrove habitat that serves as nursery ground for the reef fish population. Best season: November to May.
6. Hol Chan Marine Reserve
Hol Chan, a short boat ride from Ambergris Caye, is the oldest marine reserve in Belize and one of the most visited. A channel cut through the barrier reef creates a tidal current that aggregates fish in extraordinary concentrations. Goliath grouper Epinephelus itajara, several species of snapper, and large schools of grunts are visible from the surface. Nurse sharks are present on the sandy floor. Snorkeling-accessible. Best season: November to April.
7. Shark Ray Alley, Hol Chan
Shark Ray Alley is a specific site within the Hol Chan Reserve where a history of fish cleaning by local fishermen has created a permanent aggregation of nurse sharks Ginglymostoma cirratum and southern stingrays Hypanus americanus. Snorkelers and divers hover over the sand while sharks and rays circle below. The site is one of the most visited in Belize and can be crowded; early morning visits produce a more composed experience. Best season: December to April.
8. South Water Caye Marine Reserve
South Water Caye sits on the inner barrier reef south of Belize City and protects both reef and seagrass habitat. The combination is ecologically significant: the seagrass beds immediately behind the reef support manatee Trichechus manatus populations and serve as foraging habitat for green turtles. The reef itself has been less impacted by tourism pressure than northern sites and offers consistently good coral cover and fish life. Best season: February to May.
9. Sapodilla Cayes
The Sapodilla Cayes are the southernmost reef area in the Belize system, near the Guatemalan and Honduran borders. The Marine Reserve here is less visited than northern Belize sites and offers a less commercialised reef experience. Coral cover is high on the outer faces; whale sharks Rhincodon typus pass through in season during spring. The cayes themselves are remote sandy islands with limited accommodation. Best season: February to June.
10. Bacalar Chico Marine Reserve, Ambergris Caye
At the northern tip of Ambergris Caye, Bacalar Chico protects the barrier reef alongside a UNESCO-listed Maya archaeological site at the water's edge. Manatees Trichechus manatus, crocodiles, and a healthy mangrove network are inland; the outer reef face has good soft coral growth and American saltwater crocodile Crocodylus acutus are occasionally seen near mangrove margins. A reef system with rare combined archaeological and marine conservation significance. Best season: December to March.