The Great Blue Hole
A vast circular sinkhole off the coast of Belize, formed when cave systems flooded at the end of the last glacial period. This underwater wonder ranks among the world’s most celebrated dive sites.
At a glance
The Great Blue Hole lies 70 kilometers off the Belize coast, near Lighthouse Reef, within the Belize Barrier Reef Reserve System. Its nearly perfect circular formation spans 300 meters across, with a maximum depth of 124 meters. The dramatically darker blue of its waters signals exceptional depth compared to the surrounding shallows.
History
The hole began as a limestone cave approximately 150,000 years ago. As glacial periods ended, water levels rose gradually, flooding the cave system and causing its roof to collapse. This geological transformation created the distinctive sinkhole visible today.
French explorer Jacques-Yves Cousteau brought international attention to the site, famously declaring it “one of the top ten dive sites in the world.” That endorsement established the Blue Hole as a premier destination for diving enthusiasts globally.
What you see
The hole’s almost perfectly circular rim frames crystalline waters that shift from deep indigo to pale turquoise toward the reef’s edges. Limestone walls descend to 124 meters, creating dramatic visual contrast with the shallow waters surrounding Lighthouse Reef.
Cultural significance
The Great Blue Hole represents a rare geological formation and a living marine ecosystem. Designated part of the UNESCO World Heritage Site Belize Barrier Reef Reserve System in 1996, it exemplifies both natural wonder and ecological importance. For the diving community, it remains an iconic destination offering pristine waters, nurse sharks, Caribbean sharks, and bull sharks alongside diverse coral and marine flora.
Key facts
- Coordinates: 17.3160527, -87.5373325
- Address: Belize City, Estero
- Depth: 124 meters at deepest point
- Width: 300 meters
- UNESCO designation: Part of Belize Barrier Reef Reserve System (1996)
- Official website: https://greatbluehole.net/
Practical information
The Great Blue Hole is accessible only by boat. Most visitors arrange diving or snorkeling excursions from tour operators in Belize City. Check the official website for current conditions and licensed dive operators.
Getting there
The site lies 70 kilometers offshore from Belize City. You will need to arrange passage by boat; helicopter tours and guided diving expeditions depart regularly from the mainland. Weather conditions affect accessibility, particularly during hurricane season.
Sources & resources
Find it on the map
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