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A submarine cave or sinkhole, a roughly circular, steep-walled depression that is typically anoxic below a certain depth.
The Great Blue Hole lies within the Atoll's lagoon about 8km north of Half Moon Caye Natural Monument.
There are diving and snorkel sites galore and the Great Blue Hole is also within reach of Ambergris.
Only a short distance from Half Moon Caye is the Blue Hole the diving trip of a lifetime.
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