One of the world’s most precious natural wonders, the Great Barrier Reef is the Earth's largest coral reef system and one of the few living organisms visible from space. Consisting of almost 3,000 individual reefs and 900 islands, and stretching for 1,615 miles (2,600km), its diverse ecosystems shelter more than 1,500 species of fish, around 30 species of whale, dolphin and porpoise, six species of turtle and 15 species of sea snake. Sadly, climate change is a huge threat to the reef, which has seen UNESCO recommend the site be added to its 'in danger' list once again.
Incredible places that will be underwater by 2050