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 ?
Kiribati includes Kiritimati (Christmas Island), the largest coral atoll in the world, and Banaba (Ocean Island), one of the three great phosphate islands in the Pacific.
Stationed on Christmas Island, a coral atoll in the South Pacific in 1957, he was ordered to stand and watch as scientists detonated three bombs - each bigger than the blast which flattened Hiroshima.
MALDIVES ITC Classics (01244 355 527) offers seven nights for price of six - from pounds 1,665, saving pounds 119 - at One & Only Kanahura on coral atoll in shimmering Indian Ocean.
Jeffrey Bozanic, Vice President of Deltron's Blu Vu division, has completed a diving expedition for the Natural History Museum of Los Angeles and collected what appears to be a new species of brittle sea star from the Pacific Ocean's easternmost coral atoll.
According to Tewolde Gebremariam, CEO of Ethiopian Airlines, Seychelles is well-known for its beauty and the home of two UNESCO designated World Heritage Sites; the world s biggest raised coral atoll and Praslin s Vallee de Mai is said to be the site of original Garden of Eden.
The world entered the new Millennium at exactly 1000 GMTyesterday when clocks struck midnight on a usually uninhabited coral atoll in the South Pacific.
Sediment and sand filled in the Everglades basin, built up the coral atoll and eventually connected the atoll to the mainland.
The ocean once submerged this flat coral atoll, which lingers just a few feet above sea level, showing off 12 miles of powdery white sand.
He added, Seychelles is home to two UNESCO World Heritage Sites: Aldabra, the world s largest raised coral atoll and Praslin s Vallee de Mai, once believed to be the original site of the Garden of Eden.
They were rescued from a tiny coral atoll after surviving for six days on shellfish, coconuts and wild plums.
Affectionately known as 'the rock,' Niue is reputedly the largest upraised coral atoll in the world.
Tewolde Gebremariam, said, Ethiopian is pleasedto fly to the legendary beauty and exotic Seychelles, which is a home to twoUNESCO World Heritage Sites: Aldabra, the world s largest raised coral atoll andPraslin s Vallee de Mai, once believed to be the original site of the Garden of Eden.