This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
If the file has been modified from its original state, some details may not fully reflect the modified file.
Exploring Oceans: Great Barrier Reef
March 30, 2009
The largest living structure, the Great Barrier Reef spans more than 1,200 miles (2,000 km) of islands and submerged reefs.