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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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A ring-shaped coral reef that surrounds a lagoon without projecting land area and that is surrounded by open sea.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


a circular coral reef or string of coral islands surrounding a lagoon
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


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References in periodicals archive ?
Ferry services to these three atolls were previously provided by Vermillion.
To make matters worse, the oil is spilling into a UN Heritage Site known as East Rennell, and it is slowly damaging the coral atoll and the wildlife surrounding it.
Before leaving for a dream assignment to Rose Atoll Marine National Monument, a 13,000-squaremile swath of protected waters in the far reaches of the Pacific Ocean, photographer and filmmaker Ian Shive had to go through a litany of tests.
Fringing reefs remain around the shoreline while ( barrier reefs and atolls form when the land sinks below the ocean surface.
The nation's atolls are the geologic remnants of volcanic islands that subsided into the ocean over eons.
Speaking to reporters at his office, Foreign Affairs Secretary Albert del Rosario corrected earlier reports that China had taken control of the Quirino atoll, also known as Jackson atoll, a ring-shaped coral reef located 140 nautical miles from Palawan.
Starting Wednesday, Tuvalu inaugurated a 500 kW solar PV power plant on the atoll of Funafuti.
and the Philippines have expressed concern that China's land reclamation projects around reefs and atolls could be used to base military planes and navy ships to intimidate other claimants and threaten freedom of navigation, and have called for a freeze on such activity.
In contrast to the rapidly developing capital, there is a lack of uniform development in other islands and atolls of the Maldives.
Male, March 3 -- The United States Embassy, in partnership with the Maldivian Ministry of Education, delivered yesterday 983 books worth nearly $13,000 USD (201,000 Rufiy) to the Gnyaviyani Atoll Education Center in Fuvahmulah, Maldives.
The United States conducted nuclear tests on and around the Bikini and Enewetak Atolls, two of the 29 atolls and five islands comprising the Republic of the Marshall Islands, from 1946 to 1958.