The atoll is comprised of four large coral islands which enclose a shallow lagoon; the group of islands is itself surrounded by a coral reef.
A ringlike coral island and reef that nearly or entirely encloses a lagoon.
a group of volcanic and coral islands in the central Pacific.
a group of about 80 coral islands in French Polynesia.
matches, and cans of beer and rowed for a few miles across the Caribbean until they arrived at a tiny coral island.
These snails do not occur on low-lying coral islands.
Many types of seabirds inhabit the coral island.
coral island, coral reef, and atoll