Australia’s Best Islands for Diving

From the coral cays of the Great Barrier Reef to the remote atolls of the Indian Ocean, Australia offers an extraordinary range of island diving experiences. Whether you’re seeking manta rays, dramatic walls, pristine coral gardens or remote offshore adventures, these islands deliver some of the country’s most memorable underwater encounters.

Heron Island – Southern Great Barrier Reef, Queensland

A classic coral cay sitting directly on the reef rim, Heron Island is famous for crystal-clear water, thriving coral gardens and exceptional turtle encounters. With dive sites only minutes from shore, divers spend less time travelling and more time underwater.

The reef surrounding Heron Island is a mix of sandy channels, bommies and coral gardens alive with fish life. Heron Bommie is one of the island’s signature sites, where large coral heads form a natural cleaning station for manta rays, eagle rays and turtles.

Best time to dive:

• Year-round destination
• November–March for turtle nesting
• January–April for turtle hatchlings
• July-August for mantas and lots of ray action

How to get there:

• Fly or drive to Gladstone, Queensland
• Transfer via resort catamaran or helicopter
• Closest international airport: Brisbane

Lady Elliot Island – Southern Great Barrier Reef, Queensland

Lady Elliot Island is one of Australia’s premier destinations for manta ray encounters. This coral cay combines excellent visibility with easy access to dive sites, making it ideal for both experienced divers and relaxed resort-based holidays.

Dive sites range from shallow coral gardens to cleaning stations and walls rich in marine life. Lighthouse Bommie is the standout site for manta encounters, while Coral Gardens is a vibrant shallow reef often described as a natural aquarium.

Best time to dive:

• Year-round diving destination
• June–August for manta rays
• November–April for turtle nesting and hatchlings

How to get there:

• Scenic flights from Bundaberg, Hervey Bay, Brisbane or the Gold Coast
• Closest international airport: Brisbane

Great Keppel Island – Capricorn Coast, Queensland

Great Keppel Island offers relaxed island diving with fringing reefs, sandy bays and short boat rides. Its easy accessibility makes it a great choice for mixed-experience groups or travellers looking for laid-back diving.

Best time to dive:

• Year-round diving
• April–November for best visibility and calmer weather

How to get there:

• Fly to Rockhampton
• Transfer to Rosslyn Bay near Yeppoon
• 30-minute ferry to the island
• Closest international airport: Brisbane

Lord Howe Island – Tasman Sea, New South Wales

Lord Howe Island delivers one of Australia’s most unique diving experiences, where tropical and temperate waters combine to create remarkable marine diversity. The island’s legendary Ball’s Pyramid dive offers encounters with Galapagos whaler sharks, kingfish and the rare Ballina angelfish, while lagoon sites provide relaxed coral garden diving.

Best time to dive:

• September–May for the best sea conditions and warmer water

How to get there:

• Daily flights from Sydney

Christmas Island – Indian Ocean Territory

Wild, remote and dramatically different, Christmas Island is known for sheer drop-offs, underwater caverns and seasonal whale shark encounters. Thundercliff Cave and Perpendicular Wall are among the island’s most spectacular dives, combining dramatic underwater scenery with abundant marine life.

Best time to dive:

• November–March for whale sharks
• April–November for calmer weather and best conditions

How to get there:

• Twice-weekly flights from Perth

Cocos Keeling Islands – Indian Ocean Territory

The Cocos Keeling Islands offer pristine atoll diving in clear turquoise water far from the crowds. Cabbage Patch, Garden of Eden and Manta Service Station showcase untouched coral reefs, pelagic fish and reliable manta encounters.

Best time to dive:

• Year-round diving
• April–November for calmer and drier conditions

How to get there:

• Flights from Perth
• Often combined with Christmas Island itineraries