- An atoll is a coral island /or islands.
- Atoll islands are low lying, with their elevations less than 5 m.
- An ancient atoll as a hill in a limestone area is called a reef knoll.
- The largest atoll is Huvadhu Atoll in the south of the Maldives.
- The second largest atoll by dry land area is Aldabra.
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| atolls of the Maldives, 1,322 islands 26 atolls. |
- Most of the world's atolls are in the Pacific Ocean.with concentrations in;
-Caroline Islands
-Marshall Islands
-Coral Sea Islands
-Island groups of Kiribati
-Tuvalu
-Tokelau
- Indian Ocean;
-Atolls of the Maldives
-Laccadive Islands
-Chagos Archipelago
- Seychelles
- The Atlantic Ocean has no large groups of atolls.
- examples of other atolls;
-East of Nicaragua,Caribbean Sea.
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| Atafu atoll in Tokelau in the Pacific Ocean |
-Northwestern Hawaiian Islands
-Elizabeth Reef
-Middleton Reef in the Tasman Sea
-Ducie Island
-Pitcairn Islands
-Bermuda
The largest atolls by total area are
- Saya de Malha Bank, Western Indian Ocean
- Lansdowne Bank, west of New Caledonia
- Chesterfield Islands, New Caledonia
- Great Chagos Bank
- Reed Bank, Spratly Islands
- Ardasier Bank, Spratly Islands
- Macclesfield Bank, South China Sea
- North Bank (Ritchie Bank, north of Saya de Malha Bank
- Rosalind Bank, Caribbean Sea
- Sabalana Islands, Indonesia
- Nukuoro atoll, Federated States of Micronesia
- Lihou Reef, Coral Sea
- Diamond Islets Bank, Coral Sea
- Bassas de Pedro
- Kwajalein, Marshall Islands
- Namonuito Atoll, Chuuk
- Truk Lagoon, Chuuk
- Maro Reef, Northwestern Hawaiian Islands
- Rangiroa, Tuamotu Islands
- Boduthiladhunmathi Atoll, Maldives
- Huvadhu Atoll, Maldives
- Kolhumadulhu Atoll, Maldives
- North Malé Atoll, Maldives
- Ari Atoll, Maldives
- Ontong Java, Solomon Islands
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| Pacific Remote Islands Marine National Monument. |
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