divedoc.net · Dive Directory
Regional South West diving overview and visibility/conditions context.
Four Mile Reef
Short-boat Busselton reef with sharks, rays, and temperate coral.
Scuba DivingBoatIntermediate18m - 22m
Reef
Boat-access South West reef in moderate depth, usually chosen for easy marine-life-focused diving when Geographe Bay conditions are settled enough for a comfortable run.
About Four Mile Reef
Four Mile Reef is a short-boat temperate reef dive off Busselton where low limestone reef, sponge and soft-coral growth, and sandy gaps create an easy-to-read site for recreational divers. The reef is known for varied South West marine life rather than dramatic relief. Divers typically cruise across broken reef looking for schooling fish, rays, cuttlefish, wobbegongs, and Port Jackson sharks while enjoying a straightforward profile in moderate depth.
Safety & Access
Site Conditions
Boat trafficSurge
Safety Notes
This is a boat-access offshore reef, so divers should plan for surface conditions, blue-water ascent discipline near the boat, and occasional surge if Geographe Bay is unsettled.
Access Restrictions
Access is typically by charter or private boat from Busselton area ramps or marinas; conditions in Geographe Bay determine whether the site is worth running on the day.
Legal Notes
Standard Western Australian marine-life protections apply. Divers should avoid disturbing protected species and follow local boating and fishing rules for the Busselton and Geographe Bay coast.
Where Is Four Mile Reef?
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Local Intel For Four Mile Reef
Community notes to help plan your visit.
Scuba Diving
A reef dive around 18 m depth.
Freediving
Possible for experienced boat-based freedivers, but Four Mile Reef is used far more often as a scuba site than as a dedicated breath-hold destination.
Snorkeling
Not a typical snorkel stop because access is by boat and the reef sits offshore in open bay water rather than a protected shoreline lagoon.
Wildlife at Four Mile Reef
Species commonly reported at this site, with direct links into their wildlife guides.
Research Estimate At Four Mile Reef
Conservative baseline from public research. No community dives logged yet.
Avg. Visibility10m
Access3/5 · Moderate entry effort
Coral3/5 · Mixed health
Aquatic Life4/5 · Great variety
Facilities2/5 · Limited facilities
CurrentLight current
SurgeLight surge
