The Great Barrier Reef is the world’s largest reef system, with 3,000 reefs running 2,300 km along most of the state of Queensland’s coast. Credit: Nickj/CC BY 3.0

The Great Barrier Reef is the world's largest reef system, with 3,000 reefs running 2,300 km along most of the state of Queensland's coast. Credit: Nickj/CC BY 3.0

 
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