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Australia

So extensive, it is visible from space, the Great Barrier Reef is the world’s largest coral reef ecosystem. Stretching 2,300 km along Australia’s northeast coastline, this complex of shallow water reefs and islands is home to thousands of species of fish, invertebrates, algae, reptiles, birds, and algae. Photo courtesy of NOAA National Environmental Satellite, Data, and Information Service (NESDIS).