The Vernon Islands (Potinga Islands) are a small, remote island group in Clarence Strait between Darwin and the Tiwi Islands, renowned for their crystal-clear seawater and extraordinary 'Blue Holes' — deep, ancient sinkholes that puncture the surrounding reef flats. These limestone-formed pools, accessible only by boat, harbour tall vase corals, staghorn corals, and schools of colourful fish. The reef flats themselves teem with blue-ringed octopuses, mantis shrimps, abalone, and an array of hardy corals. The water clarity rivals that of the Great Barrier Reef, making this a premier snorkel destination for adventurers seeking pristine, uncrowded marine habitat.
Vernon Islands (Tiwi Islands)
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Wave Height 0.1 mSwell Period 9.1 sWind Speed 4.2 knPrecipitation 5.3 mmTidal Phase ebb
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DANGER: Explicit Risks Present
Vernon Islands (Tiwi Islands) has hazards marked as danger. Entering the water here means you may face serious risks to your personal safety.
- Blue-ringed octopus danger
The Northern Greater Blue-ringed Octopus (Hapalochlaena sp.) is commonly found on the reef flats. Its venom can cause paralysis and respiratory failure.
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Community contribution: submitted by Daniel
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High risk: Blue-ringed octopus
The Northern Greater Blue-ringed Octopus (Hapalochlaena sp.) is commonly found on the reef flats. Its venom can cause paralysis and respiratory failure.
Moderate risk: Strong tidal currents
Very large tidal movements (up to 8 m) create strong, fast-moving currents over the reef flats, especially around the Blue Holes. Snorkelers must time their swim with slack tide.
Moderate risk: Remote location
Remote location with no facilities; emergency evacuation is via boat only, with limited mobile reception.
Low risk: Sharp coral rubble and heat exposure
Exposed reef flats become dangerously hot under the tropical sun at low tide, with sharp coral rubble that can cause cuts and burns.
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Getting in
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Entry
The Vernon Islands lie in Clarence Strait, approximately 50 km northeast of Darwin. Access is by private boat or via organised tours (e.g. Sea Darwin) from Darwin Harbour. The islands are on Aboriginal land (Mantiyupwi Clan) and a permit is required for independent visits; the easiest way to visit is on a guided tour.
Parking & facilities
Parking is available at Darwin Harbour boat ramps for those launching private vessels. No parking on the islands themselves.
Visitors require a permit for independent access. Guided tours (which include permits) are offered by Sea Darwin and other operators from Darwin.
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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.
Weather & swell ┬╖ Open-Meteo marine & weather APIs Tides ┬╖ UTide harmonic analysis Sea & safety ┬╖ community reports