World’s biggest coral reefs
Illustration: Ashrafun naher Ananna
Coral reefs are large underwater structures formed by colonies of corals—tiny marine animals that build hard skeletons—and they support diverse marine life like shrimp, fish, and crabs. The Great Barrier Reef, declared a World Heritage Area in 1981, is so vast it's visible from space and stretches along Australia's northeast coast, hosting 400 types of coral, 1,500 fish species, and 4,000 types of mollusc.
Source: Geographical
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