9The Great Barrier Reef, Australia

The Great Barrier Reef is the largest coral reef system in the world. It extends for 1,200 miles (2,000km) and is even visible from space. Although it has been damaged by global warming and pollution, this marine formation is still rich in life, with more than 1,500 species of fish, several different species of whales, dolphins and 6 species of sea turtles.

The nesting sites of the green sea turtle are called rookeries. There are a total of 18 along the Barrier Reef. Five of them, with more or less 30,000 nesting females, are around Raine Island and Moulter Cay in the northern section of the Great Barrier Reef. The other 13 are in the southern part, where around 8,000 females go to lay their eggs in a group of islands called Capricorn Bunker. Best time: May to October

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