Located in Northern Australia, the Great Barrier Reef is the biggest living thing on the planet which is visible even from outer space. The Great Barrier Reef is not one continuous reef, but made up of over 2900 reefs and 900 islands. It is the largest reef structure and marine park in the world. The reef is a breeding region for humpback whales, migrating from the Antarctic. It is also the habitat of a few endangered species like Dugong (Sea Cow) and large Green Sea Turtle.