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nounan island consisting of a circular coral reef surrounding a lagoontype of:
Definition that contains atoll
- bikini an atoll in the Marshall Islands; formerly used by the United States as a site for testing nuclear weapons
- midway islands an atoll in the Hawaiian Islands some 1300 miles to the northwest of Honolulu; site of an important United States naval base
- eniwetok an atoll in the Marshall Islands; site of an amphibious assault in World War II; later used temporarily by the United States to test atomic bombs
- qibla a small terrorist group of Muslims in South Africa formed in the 1980s; was inspired by Ayatollah Khomeini to create an Islamic state in South Africa
- kwajalein an atoll in the western Marshall Islands that was used as a Japanese air and naval base during World War II