What is the name given to an almost circular coral reef inside which there is a lagoon?

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Q: 51 (NDA-I/2008)
What is the name given to an almost circular coral reef inside which there is a lagoon?

question_subject: 

Geography

question_exam: 

NDA-I

stats: 

0,91,24,9,14,91,1

keywords: 

{'circular coral reef': [0, 0, 1, 0], 'barrier reef': [0, 0, 2, 0], 'reef': [1, 0, 1, 0], 'atoll': [2, 0, 0, 0], 'lagoon': [0, 0, 1, 0], 'isthmus': [3, 0, 1, 0]}

The name given to an almost circular coral reef inside which there is a lagoon is called an atoll.

Option 1: Fringing reef refers to a reef that directly attaches to the shoreline or coast.

Option 2: Barrier reef, on the other hand, is a long coral reef parallel to the coast but separated from it by a deep channel or lagoon.

Option 3: Atoll is the correct answer. An atoll is a ring-shaped coral reef or island formed when a volcanic island sinks and leaves only the reef surrounding a lagoon.

Option 4: Isthmus is not related to coral reefs. It refers to a narrow strip of land that connects two larger land areas, usually with water on either side.

Therefore, the correct answer is option 3, atoll.