Shoalwater Islands Marine Park (reefs)

High risk: Strong tidal currents around sandbar

Strong currents occur on the sandbar crossing between the mainland and Penguin Island. People have drowned attempting to cross. Only cross at low tide with local knowledge.

High risk: Penguin Island sandbar rips and currents

Water depth and currents change rapidly over the Penguin Island sandbar. Multiple drownings recorded. Use the ferry service — do not attempt to wade or swim across.

Moderate risk: Changing water depth on sandbar

Water depth and flow can change rapidly on the Penguin Island sandbar crossing, catching visitors off guard.

Moderate risk: Unpredictable sea lions

Australian sea lions are wild animals that may bite if approached too closely; maintain a safe distance.

Moderate risk: Strong tidal currents around channels

Tidal flows can create strong currents between islands, especially at Penguin Island and the causeway area.

Moderate risk: Strong currents around island channels

Tidal currents can run swiftly through the passages between islands, particularly between Penguin Island and the mainland.

Moderate risk: Swell and surge on outer reef

Limestone reef creates surge and dumping waves on the outer reef in swells above 1 m. Advanced snorkelers only beyond the yellow marine buoy.

Moderate risk: Sharks in open water

Open water beyond Point Peron's outer reef (7+ m depth, up to 1 km offshore) is frequented by hammerhead sharks, bronze whalers, and bull sharks.

Low risk: Boat traffic in marine park channels

Tour boats and private vessels operate in the narrow channels between islands. Snorkelers in open water should stay alert and be visible.

Low risk: Box jellyfish (stinger season)

Warmer months (Nov to Apr) may bring occasional box jellyfish and other stingers to protected waters.

Low risk: Boat traffic

General use zones allow recreational and commercial vessels; stay vigilant when snorkeling near channels.

Low risk: Strong winds and currents

South-westerly winds can pick up suddenly, creating choppy conditions around the exposed islands and reefs.

Low risk: Sharp reef cuts

Walking on or touching the limestone reef can cause cuts and injuries; wear protective footwear and avoid standing on live coral.

Low risk: Bluebottle jellyfish

Bluebottle jellyfish can drift into the shallow reef zones during warmer months.

Low risk: Stinger jellyfish

Box jellyfish and other stingers may be present in warmer months (November to April).

Low risk: Sharp limestone reef

The cavernous limestone reefs have sharp edges and crevices. Reef shoes are recommended to avoid cuts, and care is needed to avoid damaging the fragile reef ecosystem.

Low risk: Vehicle break-ins

Opportunistic thieves target parked vehicles. Leave no valuables in your car.