The Great Barrier Reef

This link from the National Geographic Website provides a rich learning experience with a interactive view of the Great Barrier Reef. Included is a Scavenger Hunt.
The interactive website from National Geographic

This link provides a map of the Great Barrier Reef, along with some information on it.
1st link: The Map
2nd link: More Information

Here is an image gallery 0f the Great Barrier Reef. This website may take a longer time than normal to load though.

The Gallery

Also on the same site, more information.
The History of Coral Reefs



By Douglas H. Chadwick Photographs by David Doubile

This link is also from National Geographic, of someone (probably a reader) expressing his experience of viewing the Great Barrier Reef.

P.S. You can visit the page by clicking on the picture above.