atoll

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atoll:

see coral reefscoral reefs,
limestone formations produced by living organisms, found in shallow, tropical marine waters. In most reefs, the predominant organisms are stony corals, colonial cnidarians that secrete an exoskeleton of calcium carbonate (limestone).
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atoll

[′a‚tȯl]
(geography)
A ring-shaped coral reef that surrounds a lagoon without projecting land area and that is surrounded by open sea.

atoll

a circular coral reef or string of coral islands surrounding a lagoon

ATOLL

References in periodicals archive ?
Starting Wednesday, Tuvalu inaugurated a 500 kW solar PV power plant on the atoll of Funafuti.
The key project beneficiaries are the local communities in the Addu and Gnaviyani atolls, selected private resorts, and island/atoll councils.
It is one of 71 islands forming the Noonu Atoll, situated approximately 100 miles north of the capital Male.
People on the neighboring atolls were also affected.
The four northern atolls made separate claims for direct effects of nuclear fallout on their islands.
The government-backed project involved the installation of three solar systems with battery storage on the three atolls of Atafu, Nukunonu and Fakaofo.
An added attraction to living in the area has been the frequent close-up visits from dolphins but the pods have been frightened off by the new security measures introduced a few weeks ago to two of the six atolls.
While out at Glovers Reef Atoll guests will spend six days exploring with resident marine biologists and numerous local guides this pristine marine refuge, noted for the incredible clarity of the water and the remarkable profusion of sea life.
IF Kwajalein Atoll is just two things--at least from the perspective of the Americans who work there--it might be both a paradise and a target.
The detailed image, which was taken on a Nikon D2Xs digital camera on January 23, shows the extent of the site's progress, with only construction on two southern atolls yet to start.
phoenicurus in central Yap State atolls requires further study to supplement these anecdotal accounts.
Beyond Tahiti the track crossed the Tuamotu archipelago of French Polynesia--thousands of tiny coral atolls, of which very few are inhabited, and even fewer have airstrips that make them accessible to visitors.