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Term Atoll
Definition

Coral reef in the shape of a ring or circle, which encloses or nearly encloses a lagoon, and is surrounded by open sea. It is often formed by the collapse of a volcano’s caldera. In the Dominican Republic this type of reef does not exist.

 
 

Additional Information
PhotoAtoll
PhotoFoto aérea de un atolón en las islas Maldivas
Topic  BiodiversityProtected areasResources coastal / marine