Must see

Rottnest Island

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All about Rottnest Island dive site

Abundant sea life
Cavern
Cave
Macro
Snorkeling
Turtles
Corals
Depth max
15 m
Diver level
Novice
Visibility
to 20 m
Rottnest Island is a dive site located close to Perth that features tunnels and limestone caverns covered with sponges, gorgonians, and corals. There are many crevices, huge swim-throughs, and a maze of caves.
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What to see

Rottnest Island is home to such species as lionfish, butterfly cod, nudibranchs, and various other creatures. Other species here are grouper, barracudas, snapper, wobbegongs, blue devilfish, and even leafy sea dragons.

When to go diving in Rottnest Island

The warm waters of Rottnest Island allow year-round diving, with an average temperature of 18-22C/64-72F. The best visibility is usually from September to November. Humpback whales can be seen in spring, while fall brings gray nurse sharks.