Discussion
Which of these is the world’s largest coral reef system?
Answer: C
Correct answer: The Great Barrier Reef
The Great Barrier Reef off Queensland, Australia, is by a wide margin the largest coral reef system in the world: about 2,300 km long, made up of some 2,900 individual reefs and 900 islands, and covering roughly 344,000 square kilometres. It is a barrier reef, separated from the shore by a lagoon, as distinct from a fringing reef attached to the coast or an atoll ringing a submerged volcano. Charles Darwin worked out the relationship between the three, proposing that a fringing reef becomes a barrier reef and then an atoll as the island beneath it subsides. It supports thousands of species of fish, molluscs and corals, and has been a UNESCO World Heritage site since 1981. Repeated mass bleaching events since 2016, driven by marine heatwaves, have caused severe coral loss. The Belize Barrier Reef is the largest in the Atlantic and the second largest overall.
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