The Great Barrier Reef

The great barrier reef is the largest coral reef in the world, and is the only living thing visible from space. The coral reef is in some parts 65 km wide, and it is 3,000 km long. The coral reef contains over 400 different kinds or coral, and 1,500 different types of tropical fish. The great barrier reef serves many purposes, such as being a breeding ground for humpback whales, and a home for endangered species.