Meet the site
Three Rocks, or 3 Rocks, consists of three large bommies spread down a steep sandy slope that runs from about 2 m to 25 m. The slope is one of the drains of Wistari Reef, the large reef to the west of Heron, and water pours through it as the tide changes. When the current runs towards the old jetty, the site becomes one of Heron's best drift dives. The moving water brings in pelagic fish that patrol the slope and the edge of the channel. The three bommies are covered in hard corals and host a variety of reef fish, and nudibranchs are common on the coral. Olive sea snakes are a feature: they come into the shallower water to feed before retreating to the deeper channel. The usual plan is to descend to the deepest bommie, then drift from rock to rock, gradually ascending up the slope, which gives a natural multi-level profile. The sandy slope between the bommies is worth watching too, as rays and garden eels can be found there. Because of the depth and current, the site suits divers with some experience, ideally Advanced certification. It is in the resort's top ten sites and is often chosen when the tide is running the right way. Divers who enjoy Three Rocks will also enjoy the Wistari Wall sites across the channel, which offer a deeper, steeper version of the same tidal environment. If the current is running the wrong way, guides may dive the bommies as a stationary dive from the deeper rock upward, returning along the slope, so the site can still be enjoyed away from the ideal tide.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Three Rocks (Heron Island) is recorded as Drift in Heron Island & Capricorn Group. The listed access is boat (day trip). 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.
- Current and timing
- Ask how the operator assesses the current window for the actual route. Historical tide notes are not a departure instruction.
- Other water users
- Ask about vessel activity, exclusion areas and the agreed surface arrangements.
- Planned depth
- Confirm the intended route and training requirements; the recorded maximum is not a target.
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 Three Rocks (Heron Island) suitable for my certification?
The record lists Advanced 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 Three Rocks (Heron Island) 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
Pelagic fish (trevally, mackerel), olive sea snakes, nudibranchs, hard corals, reef fish, rays, garden eels
Location
Three large bommies spread down a steep sandy slope from 2 to 25 m at one of the drains of Wistari Reef; an excellent drift when the current runs towards the old jetty.
Facilities nearby
Heron Island Resort dive centre beside the harbour: gear hire, rinse tanks, lockers; resort restaurant and bar. Access is for resort guests only.
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
diversiondivetravel.com.auheronisland.commarinelife.org.auRecord updated 26 Sept 2026. Source claims are being reviewed.