Diving in Australia, 

Oceania

 Australia is known for the world's largest 'great barrier reef' 200+ miles off the east coast of Queensland, and the Coral Sea where schools of pelagics are found. There is also a large reef north of Western Australia to dive. 
Great White sharks are on the south coast, whale sharks in the west  and whales migrate along the east coast.

New South Wales : Northern Territories : Queensland : South Australia : Victoria : Western Australia : Tasmania : Christmas Island

• Australian Marine Conservation Society www.amcs.org.au
• Australian Institute of Marine Science (AIMS) www.aims.gov.au