The Great Blue Hole off the coast of Belize is one of the planet's most striking natural wonders — a near-perfect circular marine sinkhole over 300 metres across and around 125 metres deep, ringed by coral reef. Here's what it is and how to experience it.
What It Is
The Great Blue Hole is a giant underwater sinkhole that formed as a limestone cave during past ice ages, collapsing and flooding as sea levels rose. From above, its deep blue circle against the turquoise reef is unmistakable — part of the Belize Barrier Reef, a UNESCO World Heritage Site.
Diving It
It's a bucket-list dive, famous for its giant stalactites and the eerie, deep-blue descent. Because of the depth, it's best suited to experienced, advanced divers; trips run as full-day excursions from the coast and cayes.
Snorkelling & Scenic Flights
Non-divers can still experience it — snorkelling tours visit the surrounding reef, and the most popular way to appreciate its perfect shape is a scenic flight over the hole, which is breathtaking from the air.
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How to Visit
Most trips depart from Belize City, San Pedro (Ambergris Caye), or Caye Caulker. It's a long boat journey out, so day tours are a full commitment — book with a reputable operator and choose your experience (dive, snorkel, or flight) to match.
Frequently Asked Questions
Most trips depart by boat from Belize City, San Pedro (Ambergris Caye), or Caye Caulker as full-day excursions. Experienced divers can dive it, non-divers can snorkel the surrounding reef, and many people take a scenic flight over it to appreciate its perfect circular shape from above.