The Great Barrier Reef
Some Interesting Facts and Figures

The Great Barrier Reef is a very special place! It is not one continuous reef, but made up of over 2900 reefs and 900 islands.

It is the largest reef structure and marine park in the world. It is so large that it is visible from the moon. Astronauts have described it as “a thin white line off the east coast of Australia”.

Length	Approximately 2300 km (1300 miles). It begins near Papua New Guinea in the north, and continues south along the Queensland coast to Bundaberg (just north of Brisbane).
Width	24 km wide in the north to over 240 km wide in the south
Area	Approximately 35 million hectares (about 70 million football fields!)

A complex geological history

The Great Barrier Reef first began to grow about 18 million years ago. Since this time, various geological events, such as Ice Ages and low seawater levels have interrupted reef growth. The reefs we see today have grown on top of older reef platforms during the last 8000 years – since the last Ice Age.

Amazing marine life diversity

The Great Barrier Reef has some of the highest marine life diversity in the world, including:

• 450 type of corals
• 1500 types of fish
• 4000 types of molluscs.

There are more different species of animals and plants in a cubic metre of the Great Barrier Reef than in any other environment in the world – including tropical rainforests. In fact, some reefs in the Great Barrier Reef have more different fish types than in the entire Caribbean Ocean.

	Approximate Number of Species
Type of Animal	Great Barrier Reef	Caribbean	World
Fish	1500	900	13,000
Turtles	6	4	7
Sea snakes	15	0	52
Whales & Dolphins	26	22	75
Hard Corals	350	50	1260
Snails & Clams	4000	1200	100,000
Giant Clams	6	0	9
Nudibranchs (sea slugs)	350	130	1550
Sea Stars (starfish)	100	18	1800
Sea Cucumbers	115	25	1400

For more information visit the Quicksilver Environmental Division, Reef Biosearch