Great Barrier Reef (image) University of Texas at Austin Share Print E-Mail 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 Share Print E-Mail 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.