Earth Valentine: Australia's Heart Reef

Heart Reef in the Great Barrier Reef — Heart Reef, part of Australia's Great Barrier Reef. (Image credit: Mornee Sherry | Shutterstock)

The Great Barrier Reef is the world's largest coral reef system (and it's largest living structure ), comprising nearly 3,000 individual reefs and 900 islands off the eastern coast of Australia.

One of these thousands of reefs is Heart Reef, so named for its shape. It is located in the Whitsunday Islands and must be viewed from the air as the area is protected and snorkelers and scuba divers are not allowed to enter.

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