Meet the site
Trennents Rock is a reef a few hundred metres south of the Tollgate Islands. The Marine Life Network lists it at 7–25 m and highlights huge numbers of pelagic and reef fish, weedy sea dragons and kelp beds. Beyond that brief summary it is not well documented, but it shares the character of the Tollgate Islands reefs, with the added exposure of sitting a little further out into the bay.
The shallower parts of the reef are covered in kelp, which is where the weedy sea dragons live. They are best found by moving slowly and scanning just above the kelp canopy. Deeper, the reef breaks into boulders and ledges with sponges and sea squirts, and the reef edge attracts schools of yellowtail, sweep and bream, with kingfish, bonito and trevally passing through, particularly in summer. Blue groper, red morwong, wobbegongs and eastern blue devilfish are the usual reef residents, and grey nurse sharks from the nearby Dragon Rock colony may pass.
The site suits Open Water divers who stay on the shallow kelp and Advanced divers who want to explore the deeper edge. It is a good alternative to the island sites when they are busy or when divers want pelagic action. Coordinates here are approximate, estimated from the 'few hundred metres south of the Tollgate Islands' description. Check with a local operator for the exact mark, and treat the depth range as indicative. It is unclear whether the reef is inside the Tollgate Islands sanctuary zone, so check the zoning map before fishing.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Trennents Rock is recorded as Reef in Batemans Bay. The listed access is 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.
- 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 Trennents Rock 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 Trennents Rock 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
Weedy sea dragons, yellowtail, sweep, bream, kingfish, bonito, trevally, blue groper, red morwong, wobbegongs, eastern blue devilfish, kelp, sponges
Location
Reef a few hundred metres south of the Tollgate Islands, Batemans Bay, with huge numbers of reef and pelagic fish, weedy sea dragons and kelp beds; 7–25 m.
Facilities nearby
Hanging Rock boat ramp; air and nitrox at Beneath the Bay.
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
marinelife.org.auRecord updated 27 Sept 2026. Source claims are being reviewed.