Heart Reef, Great Barrier Reef, QLD © Tourism Australia

Australia's coral reefs

Helicopter flight over Heart Reef, qualia, Great Barrier Reef, QLD © qualia

Helicopter flight over Heart Reef, qualia, Great Barrier Reef, Queensland

Manta rays, Lady Elliot Island, Southern Great Barrier Reef, QLD © Andrew Watson Photography and Tourism & Events Queensland

Manta rays, Lady Elliot Island, Southern Great Barrier Reef, Queensland

Swimming with whalesharks, Ningaloo Marine Park, WA

Swimming with whalesharks, Ningaloo Marine Park, Western Australia

Montgomery Reef, Kimberley region, WA © Garry Norris Photography

Montgomery Reef, Kimberley region, Western Australia