Cook Island (Turtle Island)

High risk: Strong tidal currents

Strong tidal currents sweep around the island, making unguided swimming or kayaking extremely dangerous. Fatalities have occurred. Tours operate only in safe conditions.

High risk: Surging Waves Near Rocks

Waves breaking against the island's rocks create a surge zone. Snorkellers must stay 15–30m clear of the rocks to avoid being pushed into them.

Moderate risk: Choppy conditions and swell

The exposed ocean location can produce choppy seas and wind-affected conditions, especially in summer afternoons. Tour operators monitor conditions closely.

Moderate risk: Marine stingers

Box jellyfish and other stingers may be present during the warmer months (November to May). Wetsuits are recommended.

Moderate risk: Swell surge towards rocks

Swell and surge can push swimmers towards the rocky shoreline of Cook Island, requiring strong swimming ability.

Moderate risk: Rough conditions

The water around the island can be rough even when coastal conditions appear calm; weather can change quickly.

Moderate risk: Strong currents and ocean swell

Cook Island is exposed to ocean swells and tidal currents that can sweep snorkellers away from the island. Calm conditions essential.

Moderate risk: Ocean swell and surge

Swell can push snorkellers toward the rocky shoreline of Cook Island, requiring strong swimming ability to maintain position.

Moderate risk: Tidal currents

Strong tidal flows can develop between the island and mainland, particularly on an outgoing tide, making swimming back difficult.

Moderate risk: Tweed Bar crossing

The Tweed River bar crossing can become dangerous in southerly swells and strong outflow; boat access should only be attempted by experienced skippers or via commercial tours.

Moderate risk: Strong Currents & Swell

Ocean currents and swell around the island can push snorkellers towards the rocky shoreline. Conditions may be rough even when the coast appears calm.

Moderate risk: Drift Snorkel Current

Strong currents on the south side of the island create a drift-snorkel scenario. Only confident swimmers should attempt this; inexperienced swimmers may struggle.

Moderate risk: Strong Currents

Moderate to strong currents can develop around the island, especially on the southern side where drift snorkeling occurs.

Moderate risk: Swell and Surge

Ocean swell and surge can push snorkelers toward the rocky shoreline of the island.

Moderate risk: Swell and surge near rocks

Waves breaking on the island's rocky shore create a surge that can push snorkellers towards the rocks. Conditions can be rough even when the coast appears calm.

Moderate risk: Swell and surge towards rocks

Swell can create a surge that pushes swimmers towards the rocky shoreline of the island. Conditions may appear calm from shore but can be rough around the island.

Moderate risk: Ocean swell

Exposed to easterly swells that can create surging conditions over the ledges.

Low risk: Shark presence

Sharks including wobbegongs, grey nurse sharks and bull sharks are present in the reserve; generally not aggressive but swimmers should be aware.

Low risk: Boat traffic

Boats use the waters around Cook Island; stay within the tour group's designated snorkel zone and watch for vessel traffic.

Low risk: Strong currents

Tidal currents can sweep around the island, especially during outgoing tides. Snorkelers should stay with their tour group and guide.

Low risk: Sea sickness risk

The 600 m boat crossing can be choppy depending on conditions. Individuals prone to motion sickness should take precautions.

Low risk: Marine stingers (seasonal)

Bluebottles and jellyfish can be present, particularly in warmer months.

Low risk: Rough conditions in poor weather

Sea conditions around Cook Island can be rough even when the coast appears calm; white water can surround the island.

Low risk: Marine traffic

Boat traffic in the area near the island and Tweed River entrance requires awareness.

Low risk: Rough sea conditions

Even when the coast appears calm, surrounding waters can be rough; tour operators monitor conditions closely before departing.

Low risk: Sharks

Wobbegong and bull sharks are occasionally sighted; while generally not aggressive, they should be given respectful distance.

Low risk: Changing weather

Swell and wind conditions can change rapidly, reducing visibility and making boat travel uncomfortable.

Low risk: Swell and wind exposure

The island provides reasonable shelter, but the east side can be affected by south-easterly winds and swell, creating challenging surface conditions.

Low risk: Vessel traffic

Boat traffic in the aquatic reserve — snorkelers must stay aware of vessels approaching moorings.

Low risk: Boat Traffic

The reserve is accessed by boat, and mooring areas see dive/snorkel tour vessels operating. Snorkellers should be aware of boat movements near entry/exit points.

Low risk: Bluebottle jellyfish

Portuguese man o' war (bluebottles) frequent the area during north-easterly winds, typically spring through autumn.

Low risk: Stingers (Nov-Apr)

Stinging jellyfish and bluebottles can be present in warmer months.

Low risk: Bottom-dwelling marine life

Wobbegong sharks and stingrays resting on the sandy bottom can be startled if stepped on.

Low risk: Rocky Shoreline

Sharp rocks and breaking waves along the island's edge pose a hazard for swimmers getting too close.

Low risk: Sharp reef

Rocky ledges and reef shelf have sharp edges; scrapes and cuts are common in surge zones.

Low risk: Strong currents around island points

Tidal currents can be strong around the northern and southern headlands of the island, especially on an outgoing tide.