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Aerial view of a large coral reef system in a blue ocean.

Aerial view of a large coral reef system in a blue ocean.

Great Barrier Reef , Australia. The Great Barrier Reef is the world's largest coral reef system, located off Queensland, Australia. It is famous for its rich marine biodiversity, stunning coral formations, and vibrant underwater life. The reef is composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). See more