Great Barrier Reef Near Whitsunday Islands

The Great Barrier Reef is the largest reef system on Earth, with more than 3,000 separate reefs and coral cays. It is also one of the most complex natural ecosystems, with 600 types of corals and thousands of animal species from tiny planktons to whales.

Rio de Janeiro: A Changing City

In 1960, 5 million people lived in Rio de Janeiro. By 2015, the population had swollen to 12.2 million, making it Brazil’s second largest city.