Rottnest Island · Western Australia
Rottnest Island
Limestone caverns, swim-throughs, ledges and walls 18 kilometres off Fremantle.
Rottnest Island's limestone geology creates reefs, caverns, swim-throughs, walls and ledges that are genuinely distinct from mainland Perth diving.
Marine life reflects a warm-temperate mix influenced by the Leeuwin Current, which brings tropical species considerably further south than the latitude would suggest.
Sites range from sheltered bays suitable for training to exposed offshore reefs and wreck sites, so the island accommodates a wide range of experience.
Max depth
35 m
typically 15 m
Access
boat & shore
Current
variable
Water temp
18–23°C
Level
advanced
| Region | Rottnest Island |
|---|---|
| State | Western Australia |
| Access | boat and shore |
| Site type | reef, cave, wall |
| Minimum depth | 3 m |
| Typical depth | 15 m |
| Maximum depth | 35 m |
| Current | variable |
| Visibility | Often 15–30 m |
| Water temperature | Roughly 18–23°C |
| Experience level | beginner, intermediate, advanced |
These are guidance categories, not guarantees. Conditions on the day, and an operator’s own requirements, override any classification here.
- western blue gropers
- tropical and temperate fish together
- coral growth at high latitude
- crayfish
- rays
- occasional sea lions
Access
- Ferry from Fremantle or Perth, or dedicated dive charter.
- Ferry access limits which sites are reachable.
- Charter access handles cylinders and gas.
Hazards
- current on exposed sites
- surge in caverns and swim-throughs
- overhead in cavern routes
- boat traffic
Operators servicing this site
Businesses documented as regularly diving this site. Only operators we have established a connection for are listed.
Training that is genuinely useful here
Not a list of everything available — the qualifications that actually change what you can do at this site.
Related dive sites
Worth reading alongside this one.
Dive sites nearby
Other documented sites within range, nearest first — useful for building a trip rather than a single dive.
Other dive businesses in the area
Not documented as servicing this site, but close enough to be useful for fills, hire or advice.
Frequently asked questions
How deep is Rottnest Island?
Depths range from around 3 metres to roughly 35 metres, with a typical profile around 15 metres. Conditions and route selection change this considerably.
Is Rottnest Island suitable for beginners?
It can be, in reasonable conditions and with appropriate supervision. Conditions on the day matter more than certification level, and operators may impose their own requirements.
How do you get to Rottnest Island?
Access is boat and shore based. Ferry from Fremantle or Perth, or dedicated dive charter.
Is there current at Rottnest Island?
Current is recorded as variable. Conditions vary daily and should be checked close to the day.
What will I see at Rottnest Island?
Commonly reported marine life includes western blue gropers, tropical and temperate fish together, coral growth at high latitude, crayfish, rays, occasional sea lions. Sightings are never guaranteed.
When is the best time to dive Rottnest Island?
Conditions vary through the year. Visibility is often 15–30 m. Check with local operators close to your dates.
Where is Rottnest Island?
Rottnest Island is in the Rottnest Island region of Western Australia.
Last researched: September 2026. Dive businesses change frequently — confirm current services, prices and requirements directly with the operator before booking.