Mermaid Reef (Crowdy Head / Port Macquarie)

High risk: Swell and surge

Exposed to the full Tasman Sea swell, the reef can experience large waves and heavy surge, especially in SE winds.

Moderate risk: Strong ocean currents

Open-ocean tidal currents can be powerful and unpredictable around the reef, posing risk to swimmers.

Moderate risk: Vessel traffic

The reef lies 15 NM offshore and is frequented by recreational fishing boats; boat strike is a hazard.

Moderate risk: Remote location

No shore infrastructure nearby; medical evacuation would be extremely delayed in an emergency.

Moderate risk: Strong offshore currents

Exposed offshore reef subject to tidal flows around pinnacles and gutters

Moderate risk: Depth range 12–30m

Significant depth variation requires good free-diving or scuba ability

Moderate risk: Swell exposure

Open ocean exposure to east coast swells, especially in winter and spring

Moderate risk: Deep water drop-offs

The reef ranges from 12 m to 30 m depth with sudden drops — easy to exceed safe free-diving depths.

Moderate risk: Rough sea conditions

Exposed offshore location; swells and wind chop can build quickly, making boat exit and entry hazardous.

Low risk: Boat traffic

Accessible only by boat; dive/snorkel vessels and local fishing boats operate in the area