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.

Boat access only. Local boats launch at the four-lane Quarantine Bay ramp 3 km south of Eden (toilets, cleaning tables, trailer parking) or from Snug Cove in the town harbour and run south across Twofold Bay. The Marine Life Network places the reef off southern Twofold Bay in a relatively exposed spot; no position has been published.

Ask Eden or Merimbula operators for the mark.

The Marine Life Network describes the site as relatively exposed with varied conditions. Dive only with swell under about 1.5 m and light winds. Current is more likely here than inside the bay.

Visibility is often good but falls after heavy rain. Mornings are usually calmest.

Descend the line onto the reef at about 20 m, explore the sea whips and gorgonians along the reef, watch the blue for pelagics, and return to the line with a safety stop. Carry an SMB in case of current.

Listed by the Marine Life Network; no current operator publishes it.