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 ?
A government press release said the International Seabed Authority (ISA) had approved Japan's plan to probe a 3,000-square-kilometre area beneath international waters off the isolated Japanese coral atoll of Minamitorishima.
Aldabra, the world's largest raised coral atoll, is surrounded by a pristine marine environment, uninhabited and known for its distinctive fauna including the Aldabra Giant Tortoise.
According to TIGHAR, the 18-person research crew aims to locate, identify, and photograph any and all surviving aircraft wreckage that they believe may be in the deep waters surrounding Nikumaroro (formerly Gardner Island), an uninhabited coral atoll in the southwestern-Pacific Republic of Kiribati.
Enhanced analysis of the image appears to show the landing gear of an aircraft protruding from the waters off Gardner Island, a tiny uninhabited coral atoll, 2,000 miles north west of Australia.
Washington, Mar 27( ANI ): The United States and Australia are planning to augment military ties, including possible drone attacks from a coral atoll in the Indian Ocean and increased U.
Home to the world's largest coral atoll and more than 220 species of coral and 1,000 species of fish, they also act as a refuge and breeding ground for everything from tuna, dolphins and sharks to rare coconut crabs and hawksbill turtles.
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.
The fiberglass booth hunkers down on the seabed of Hideaway Island, a coral atoll (donut-shaped reef island enclosing a lagoon).
After the 23 nuclear explosions that the United States conducted on this remote coral atoll in the 1940s and '50s, one almost expects to visit today and find just a few charred islets surrounded by brackish water emitting an eerie glow.
Sited on a coral atoll in the western Pacific Ocean, the 3-square-mile airfield, was the refuelling and replenishment station for the US Navy and Air Force during World War II.
HONG KONG - The Philippines said Wednesday that it had protested signs of land reclamation by China aimed at expanding a disputed coral atoll near the southern Philippines, the latest in a series of disputes pitting China against its neighbors in the South China Sea.