Some people call it an underwater wonderland.Others call it the most magical place on our planet.We are talking about one of the great wonders of our natural world—the beautiful and amazing Great Barrier Reef located off the east coast of Australia.

The Great Barrier Reef is not just one reef but actually a series of over 2,000 reefs stretching for more than 2,300 kilometres.It is the world’s largest coral reef.A coral reef is a natural barrier made up of the bodies of living and dead coral.Coral reefs exist in warm climates with clear salt water and lots of sunlight.And since coral reefs are also in shallow water£¬you can actually see them from above the water£¡All along the Great Barrier Reef£¬the color of the coral reef changes£¬as does the color of the water£¬which varies from a green to a blue color.