Meet the site
Seahorse Shoals is a deep reef off southern Twofold Bay, listed by the Marine Life Network at 25 m in a relatively exposed spot. It is described as a large reef with varied conditions, sea whips, gorgonians and colourful invertebrates, and pelagic fish. The name suggests seahorses have been seen there, though the description does not say so.
At 20–25 m the reef is dominated by filter feeders. Sea whips rise from the rock alongside gorgonian sea fans, sponges, sea squirts and ascidians, making a colourful garden. Fish include schools of yellowtail and sweep, red morwong, blue groper, bullseyes and nannygai, and the exposure brings kingfish, trevally and salmon. Seahorses cling to sea whips and gorgonians at such depths on the NSW coast, so it is worth looking closely.
The depth and exposure make this a site for Advanced divers with a boat or operator who knows the position. It is one of the less-documented Eden sites; the Marine Life Network summary is the only source. It combines well with the Tasman Hauler and Henry Bolte, which are in the same part of the bay. Depths and layout here are indicative and should be confirmed locally before planning a dive. Eden has a long whaling history, and humpback whales still pass through Twofold Bay each spring on their southward migration, sometimes entering the bay to rest with calves, so surface intervals can be memorable. Nitrox helps extend bottom time at this depth. Confirm the mark with a local operator before planning a trip.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Seahorse Shoals is recorded as Reef in Eden & Green Cape. 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.
- Current and timing
- Ask how the operator assesses the current window for the actual route. Historical tide notes are not a departure instruction.
- 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 Seahorse Shoals 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 Seahorse Shoals 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
Sea whips, gorgonians, sponges, sea squirts, ascidians, seahorses (possible), yellowtail, sweep, red morwong, blue groper, bullseyes, nannygai, kingfish, trevally, salmon
Location
Deep, exposed reef off southern Twofold Bay at about 25 m, with sea whips, gorgonians, colourful invertebrates and pelagic fish.
Facilities nearby
Quarantine Bay ramp and Snug Cove, Eden.
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 26 Sept 2026. Source claims are being reviewed.