Great Barrier Reef

The world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching over 2,300 km. Visible from space, it is the largest structure made by living organisms.

The world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching over 2,300 km. Visible from space, it is the largest structure made by living organisms.