a coral reef parallel to the coast of Queensland, in NE Australia. 1250 miles (2010 km) long.
Also called Barrier Reef.
British Dictionary definitions for Great Barrier Reef
Great Barrier Reef
noun
1.
a coral reef in the Coral Sea, off the NE coast of Australia, extending for about 2000 km (1250 miles) from the Torres Strait along the coast of Queensland; the largest coral reef in the world