This is the world's largest reef system - in fact, the largest thing on Earth made by living organisms, stretching for 2,600km along the coast.
Its myriad of islands and tendrils teem with fish, also supporting dugongs, dolphins, turtles and shellfish - and because of all that, a tourist trade worth several billion dollars per year. Read the full report here.
Source: by Richard Black, Environment correspondent, BBC News, UK.