A giant ocean sinkhole is located off the coast of Belize, near the center of Lighthouse Reef, an atoll of 43 mi (70 km). The hole has a perfectly round shape. It's 318m (1,043 feet) across and 407 ft (124 m) deep. The Great Blue Hole is a peculiar geological phenomenon that was formed as a result of quaternary glaciation when sea levels were much lower, hundreds of thousands of years ago. Belize Barrier Reef Reserve System is a UNESCO World Heritage Site and one of the most famous diving spots in the world.
Diving in Belize is possible year round but the best time is between April and June. This is also the time when whale sharks can be spotted. These months also see bigger crowds of divers at the Great Blue Hole. The wet season runs from June to November, but showers are quite short and bearable.
The Great Blue Hole became popular thanks to Jacques Cousteau, who included it into his top five scuba diving sites. In 1971, he and the Calypso crew studied the hole and charted its depths. The name "The Great Blue Hole" was first used by British diver and writer Ned Middleton.
The Great Blue Hole offers divers crystal-clear water and an abundance of fish species, including Caribbean reef sharks, bull sharks, and hammerheads. Skydivers also love the Great Blue Hole due to its fantastic shape from above and an ocean landing.
Practical info
When should one plan a trip to Great Blue Hole for the best experience?
Great Blue Hole can be visited any time of the year, but the months between April and June are ideal for the best diving conditions and spotting whale sharks. During the wet season from June to November, the rains might limit access to the site, but diving opportunities are still available. Show more
How did the Great Blue Hole form?
The spectacular Great Blue Hole was originally a limestone cave system formed during the last Ice Age thousands of years ago. When the Ice Age ended, the melting glaciers caused sea levels to rise, which flooded the cave system, resulting in the formation of the unique sinkhole. The vertical underwater cave is 124 meters deep, and its geological features attract divers from far and wide. Show more
What are the dimensions of the Great Blue Hole?
The Great Blue Hole has a round shape with a diameter of 318 meters and is 124 meters deep. Its enormous size, clear visibility, and depth make it an incredibly thrilling diving spot that divers from around the world flock to. Show more
What marine life inhabits the Great Blue Hole?
Diving at the Great Blue Hole provides a fantastic opportunity to witness a plethora of exquisite marine life. Caribbean reef sharks, bull sharks, and hammerheads thrive in the waters, while diving to the bottom of this magnificent sinkhole may reveal manta rays. The site also boasts of unique marine species such as sponge, coral, and various fish species that attract divers seeking a memorable diving experience. Show more
What other activities, besides diving, can visitors engage in at the Great Blue Hole?
Skydiving thrill seekers who want to experience breathtaking natural wonders can enjoy skydiving at the Great Blue Hole. While diving is the most popular activity, visitors can also enjoy swimming and snorkeling inside the Blue Hole. Nonetheless, the magnificent formation and stunning blue waters make it worth visiting for any adventure lover seeking a memorable experience. Show more
