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The total area of the atoll is.
The lagoon area is with depths ranging down to 80 feet ( 25 m ).
The total land area ( excluding peripheral reefs ) is.
The coral reef surrounding the seaward side of the atoll is generally broad, flat, and shallow at about below mean sea level in most locations and varying from 300 to 650 feet ( 100 to 200 m ) in width.
This fringing seaward reef shelf comprises an area of approximately 13. 61 square miles ( 35. 2 km < sup > 2 </ sup >).
At the outer edge of the reef shelf, the bottom slopes very steeply into deep water, at some locations dropping to more than 1, 500 feet ( 457 m ) within 0. 6 miles ( 1 km ) of the shore.

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