Meet the site
Boyinaboat Reef is one of Perth's most popular dives, a compact limestone reef in about 6–7 m at the southern end of an inshore reef chain, just 75–100 m from the sea wall of Hillarys Boat Harbour. It lies within a Marmion Marine Park sanctuary zone, is closed to vessel traffic and is marked by four yellow buoys. An underwater trail of about ten educational plaques guides divers around the reef.
The reef is small enough to explore in one dive but full of structure. Passages cut through the limestone, opening and closing again, and there are ledges, small caves, undercuts and carvings. Sponges, tube worms, bryozoans, ascidians and corals grow on it, and the corals are a decent size for such shallow, cool water. Fish include bream, leatherjackets, wrasse, scalyfin, drummer, western blue devils, blue groper and schools of garfish on the reef top, with crayfish and Port Jackson sharks under the ledges. Seagrass beds surround the reef.
Howies' Boy in a Boat page places the site at Hillarys, so the two rows have been merged here.
The hardest part is getting there. The shortest route involves climbing down steep, slippery breakwater rocks at the T-junction; the alternative is a 400 m surface swim from the steps near the car park. Neither should be attempted in swell over about 1.5 m.
Boyinaboat suits Open Water divers with some shore experience, and it is an excellent snorkel for strong swimmers. Divers who prefer an easy entry can join a boat dive from Hillarys.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Boyinaboat Reef is recorded as Reef in Perth. The listed access is shore or boat. Confirm the actual meeting point, route and permission to visit; a map pin does not establish any of these.
Topics flagged by the stored research
These are questions prompted by the existing notes, not a verified or complete hazard assessment.
- Other water users
- Ask about vessel activity, exclusion areas and the agreed surface arrangements.
- Water movement
- Ask how swell and local exposure affect the proposed entry, exit and route.
Historical access notes exist for this record, but have not been independently verified for current use. Request current directions from the operator or site manager rather than following an old entry description.
Questions, answered
Is Boyinaboat Reef suitable for my certification?
The record lists Open Water. That does not establish suitability for every route or day. Share your training, recent experience and equipment needs with the operator and ask about the specific proposed dive.
Can I book Boyinaboat Reef through YouDive?
YouDive is an independent research directory. Contact an operator directly to confirm whether it currently runs the trip, the inclusions and the booking terms.
What you might see
Sponges, corals, tube worms, bryozoans, ascidians, bream, leatherjackets, wrasse, scalyfin, drummer, western blue devils, blue groper, garfish schools, western rock lobster, Port Jackson sharks, seagrass fauna
Location
Limestone reef at the southern end of an inshore reef chain in Marmion Marine Park, 75–100 m from the Hillarys Boat Harbour sea wall, marked by four yellow buoys; a sanctuary zone closed to vessels.
Facilities nearby
Free parking behind AQWA; toilets, cafes, restaurants and shops at Hillarys Boat Harbour; dive shops and air fills at Hillarys.
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
howiesscuba.comexploreparks.dbca.wa.gov.auexploreparks.dbca.wa.gov.aumarinelife.org.audestinationperth.com.auavenueperth.comimagedive.com.auRecord updated 26 Sept 2026. Source claims are being reviewed.
