Stragglers Reef lies off the sheltered northeastern side of Carnac Island, a limestone outcrop 10 km west of Fremantle, Western Australia. This fringing reef system features shallow granite and limestone bommies draped in kelp and sponges, with crystal-clear turquoise waters that offer superb visibility. The reef is a prime snorkel destination for encountering the island's resident colony of Australian sea lions, which curl and somersault around swimmers. Beyond the playful pinnipeds, the reef teems with schools of blue groper, western king wrasse, and the occasional wobbegong shark resting beneath ledges. Reached exclusively by boat tour or private vessel from Fremantle, the site delivers a world-class wildlife snorkelling experience within 30 minutes of Perth's CBD.
Stragglers Reef (Carnac Island)
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© CalistemonDANGER: Explicit Risks Present
Stragglers Reef (Carnac Island) has hazards marked as danger. Entering the water here means you may face serious risks to your personal safety.
- Tiger snake population danger
Carnac Island hosts one of Australia's densest populations of tiger snakes...
- Tiger snakes on island danger
Carnac Island is famously populated by a large population of tiger snakes. Do not go ashore or walk on the island without proper guidance.
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Community contribution: submitted by Daniel
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High risk: Tiger snake population
Carnac Island hosts one of Australia's densest populations of tiger snakes...
High risk: Tiger snakes on island
Carnac Island is famously populated by a large population of tiger snakes. Do not go ashore or walk on the island without proper guidance.
Moderate risk: Protective sea lions
Sea lions are wild and can become aggressive...
Moderate risk: Tiger snakes on Carnac Island
The island hosts a large population of highly venomous tiger snakes; snorkelers should avoid straying inland from the beach.
Moderate risk: Strong currents and rips
The waters around Carnac Island can experience strong tidal currents and rips, particularly on the western side and during tidal changes. A man was rescued in 2024 after getting into difficulty offshore.
Low risk: Swell exposure
Southwest swells can affect the exposed western side...
Low risk: Boat traffic & restricted access
Private boaters must observe speed limits...
Low risk: Boat traffic
The island is only accessible by boat, requiring awareness of vessel traffic around the island and mooring areas.
Low risk: Cold water temperatures
Perth's ocean water can be cool, especially outside summer months. Wetsuits are highly recommended.
Low risk: Strong afternoon sea breezes (Nov–Mar)
The Fremantle Doctor (southwesterly wind) picks up in summer afternoons, creating chop and making return boat trips rougher.
Low risk: Ocean swell exposure
Southerly swells can wrap around the island, causing surge over the reef and reducing water clarity, particularly in winter.
Low risk: Tiger snakes
Carnac Island is known for a high population of tiger snakes. While they stay on land and are not a direct snorkelling hazard, visitors should be cautious when walking on the island.
Low risk: Swell and wind exposure
South-westerly winds and swell can make conditions challenging, particularly on the exposed western side. The eastern bay offers shelter in typical conditions.
Low risk: Marine wildlife interactions
Australian Sea Lions are wild animals. Healthy distances must be maintained, and touching or approaching them is prohibited. The crew advises on safe distances on tour.
Wildlife Guide
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Gallery
7 photos from the community
Getting in
Stragglers Reef is accessible only by boat. Tours depart daily from Fremantle Fishing Boat Harbour (Mews Road, Fremantle). The crossing takes approximately 20–30 minutes. Private vessels can launch from the Fremantle Boat Ramp at 47 Mews Road. Moor your boat in the sheltered coves on the northeastern side of Carnac Island near the reef.
Paid parking available at Fremantle Fishing Boat Harbour carpark (Mews Road). Additional street parking along Marine Terrace, Fremantle.
Snorkel tours range from $99–$149 per person (typically 4 hours including gear, morning tea, and lunch). Private boat: launch ramp fees apply at Fremantle Boat Ramp (~$15–$20).
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About this data
- Conditions last evaluated
- Spot data last updated
- Data sources
- Open-Meteo (marine & weather conditions), tide predictions via UTide, community contributors (descriptions, hazards, marine life).
- License
- Spot content licensed under CC BY-SA 4.0. How's the Spot is open source.