Great Barrier Reef
Great Barrier Reef stretches along the northeast coast of Australia at 2500 km. This is the world's largest ecosystem with its microclimate, the violation of which could lead to the disappearance of a unique monument of nature. The territory of the reef covers about 2900 separate reefs, surrounded by 540 hurdles, which form the coastal islands. The total area of the Great Barrier Reef 348698 square km.
A really great place and very nice pics. I once read that the largest underwater aquarium is there. Would like to add some more info to your post. http://www.eltourismo.com/the-great-barrier-reef-in-australia/