The Vernon Islands (Potinga Islands) in Clarence Strait, 55 km north-east of Darwin, are renowned for their spectacular 'Blue Holes' — deep limestone sinkholes that puncture the surrounding reef flats. These natural plunge pools, formed by erosion during past ice ages, offer crystal-clear waters teeming with colourful fish, vase corals, staghorn corals, and giant leather corals. The largest Blue Hole on the north side of North West Vernon Island is the prime snorkel site, accessible only by boat. The islands sit within the Vernon Islands Conservation Reserve and are part of the traditional saltwater country of the Mantiyupwi clan, with permanently clear waters that rival inshore coral atolls of the Great Barrier Reef.
Vernon Islands (Potinga Islands) - Blue Holes Snorkel
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Wave Height 0.1 mSwell Period 9.4 sWind Speed 1.2 knPrecipitation 12 mmTidal Phase ebb
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DANGER: Explicit Risks Present
Vernon Islands (Potinga Islands) - Blue Holes Snorkel has hazards marked as danger. Entering the water here means you may face serious risks to your personal safety.
- Saltwater Crocodile danger
Saltwater crocodiles are present in the Clarence Strait and surrounding waters. Always check local advice before entering the water.
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Community contribution: submitted by Daniel
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High risk: Saltwater Crocodile
Saltwater crocodiles are present in the Clarence Strait and surrounding waters. Always check local advice before entering the water.
Moderate risk: Blue-ringed Octopus
Blue-ringed octopus (Hapalochlaena sp.) are commonly found in shallow rubble and reef flats around the blue holes. Their venom is highly toxic — avoid touching or stepping on them.
Moderate risk: Outgoing Tide Current
Outgoing tide currents can be strong as water drains from the reef flats, making it difficult to swim back to the boat or safe entry point.
Moderate risk: Box Jellyfish (Stingers)
Box jellyfish (stingers) may be present in tropical Northern Territory waters, typically during the wet season (October to May).
Low risk: Sharp Coral Rubble
Sharp coral rubble and exposed limestone rock on the reef flats can cause cuts and scrapes. Sturdy reef shoes or booties recommended.
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Getting in
Snorkel tour
Entry
The Vernon Islands lie about 55 km north-east of Darwin in Clarence Strait. Access is by boat only — typically via guided tour operators such as Sea Darwin, launching from Darwin Harbour or Buffalo Creek. Private boat access is possible from Leeders Creek or Buffalo Creek with a 5 m boat. A permit is required to go ashore (Tiwi Aboriginal land).
Parking & facilities
Parking available at boat ramp car parks at Buffalo Creek or Leeders Creek (free public car parks).
Guided tours available from Darwin (fees vary); no public ferry service. A permit is needed to land on the islands.
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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