The Sisters is a striking limestone reef formation in Shoalwater Islands Marine Park, off Rockingham's coast in Perth's south. Named for the cluster of rocks that break the surface, this cavernous reef system offers otherworldly snorkelling through underwater nooks, swim-throughs, and rocky channels teeming with marine life. The reef's varying depths — averaging 7 metres — and its proximity to open ocean make it best tackled on calm days when the Indian Ocean settles. As part of a protected marine park, the waters here are pristine, drawing snorkellers looking for an adventurous reef exploration beyond the usual beach-entry spots.
The Sisters
IntermediateMAYBE
MAYBE
Fair. Experienced snorkellers only.
Showing last known conditions
Wave Height 1.2 mSwell Period 10 sWind Speed 3.5 knPrecipitation 5.4 mmTidal Phase ebb
Last evaluated
The spot
Community-maintained
Community contribution: submitted by Daniel
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Moderate risk: Strong swells and ocean surges
Exposed reef location can experience significant swell, especially in south-westerly winds or during winter storms. Calm conditions essential.
Low risk: Boat traffic
Located within Shoalwater Islands Marine Park where recreational and charter vessels operate. Snorkellers should stay aware and surface carefully.
Low risk: Sharp limestone reef
Cavernous limestone reef formations have sharp edges. Cuts and scrapes possible when navigating swim-throughs and rocky channels.
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Getting in
Boat
Entry
The Sisters reef is located offshore in Shoalwater Islands Marine Park, approximately 45 minutes south of Perth. Best accessed via a kayak or boat launch from Mersey Point, Point Peron, or Rockingham Beach. Several local dive and snorkel charter operators run trips to the reef from Rockingham.
Parking & facilities
Parking available at Mersey Point carpark, Point Peron carpark, and Rockingham Beach foreshore.
parkingtoilets
No entry fee for the marine park, but charter tours have fees. Boat launch fees may apply at some ramps.
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About this data
- Conditions last evaluated
- Spot data last updated
- Data sources
- Open-Meteo (marine & weather conditions), tide predictions via UTide, community contributors (descriptions, hazards, marine life).
- License
- Spot content licensed under CC BY-SA 4.0. How's the Spot is open source.
Weather & swell ┬╖ Open-Meteo marine & weather APIs Tides ┬╖ UTide harmonic analysis Sea & safety ┬╖ community reports