Great Barrier Reef (IMAGE) University of Texas at Austin Caption The Great Barrier Reef is the largest coral reef in the world. Coralline algae plays an important role in strengthening corals so they can form long-lasting reef structures. Credit Kyle Taylor/Flickr Usage Restrictions Include photo credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.