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the-great-blue-hole-is-a-giant-submarine-sinkhole-off-the-coast-of-belize-it-lies-near-the-center-of-lighthouse-reef-a-small-atoll-70-km-43-mi-from-the-mainland-and-belize-city
the-hole-is-circular-in-shape-over-300-m-984-ft-across-and-108-m-354-ft-deep
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