Hidden Reef Seven Times The Size Of NYC

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There's A Hidden Reef Seven Times The Size Of NYC Behind The Great Barrier Reef | IFLScience
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Specifically, just behind the GBR, a much deeper reef spanning an area of more than 6,000 square kilometers (2,316 square miles) has been found. That's bigger than 7.5 New York Cities.

It is covered in donut-shaped mounds, each one measuring up to 300 meters (984 feet) across and 30 meters (98 feet) thick. These are comprised of organized growths of Halimeda, a commonplace green algae made from living, calcified sediments.
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