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 ?
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 Tokelau islands are made up of three tiny atolls located about 500km north of Samoa, and some 4,000km from New Zealand's capital, Wellington.
The new 40-kilowatt facility, set up in a soccer stadium in Funafuti atoll, the capital, can serve the power needs of about 50 of the country's 1,700 households while reducing carbon dioxide emissions by around 50 tons a year, Kansai Electric said.
An overall majority of two thirds of the valid votes cast in a national poll would be required for a change in Tokelau's status and the voting should take place sequentially in Apia and on the three atolls.
In the 1980's, the peoples of Enewetak, Bikini, Rongelap and Utrok Atolls and other Marshall Islanders brought lawsuits against the United States in the United States' courts for property and other damages resulting from the nuclear tests, totaling more than $5 billion.
The largest marine protected area in the world, it spans from Kure Atoll in the west to Nihoa Island in the east.
TROPICAL HIDEAWAY: Vilu Reef Beach and Spa resort in the South Nilandhe atolls of the Maldives' DROWNED: PC Paul Nolan
Tuvalu, which has a population of 11,500 inhabitants spread over 9 atolls rising just 4.
The Great Blue Hole is at Lighthouse Reef, the outermost of Belize's three coral atolls about 60 miles from the mainland.
To prevent spread from Majuro Atoll, vaccination campaigns were conducted in other atolls and islands in RMI.
On 19 January 1972, a claim was established on two small coral atolls in the South Pacific.