The Tiwi Islands (Bathurst and Melville) sit 80 km north of Darwin in the Timor Sea, surrounded by pristine offshore reefs that remain largely untouched. These fringing and patch reefs drop into deep blue-water channels teeming with marine life, offering clear warm waters, coral bommies, and dramatic tidal flows. Part of Aboriginal-owned land, the reefs here are accessed only via guided tours, preserving their wild character. Snorkelers explore vibrant coral gardens alongside trevally, barramundi, and reef fish in a remote, culturally significant setting — a true frontier snorkeling destination.
Tiwi Islands Offshore Reefs
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Showing last known conditions
Wave Height 0.1 mSwell Period 9.1 sWind Speed 4.4 knPrecipitation 2.8 mmTidal Phase unknown
Last evaluated
DANGER: Explicit Risks Present
Tiwi Islands Offshore Reefs has hazards marked as danger. Entering the water here means you may face serious risks to your personal safety.
- Box jellyfish (stinger season) danger
Box jellyfish (Chironex fleckeri) are present in the warm coastal waters of the Northern Territory from October to May.
- Saltwater crocodiles danger
Estuarine crocodiles inhabit the coastal waters and mangrove-lined creeks surrounding the Tiwi Islands year-round.
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Community contribution: submitted by Daniel
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High risk: Box jellyfish (stinger season)
Box jellyfish (Chironex fleckeri) are present in the warm coastal waters of the Northern Territory from October to May.
High risk: Saltwater crocodiles
Estuarine crocodiles inhabit the coastal waters and mangrove-lined creeks surrounding the Tiwi Islands year-round.
Moderate risk: Tidal current
Strong tidal currents flow through the channels between Bathurst and Melville Islands and the offshore reefs, with significant movement on both incoming and outgoing tides.
Moderate risk: Remote location
Remote location with limited medical facilities; the nearest hospital is in Darwin, accessible by air or ferry.
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Getting in
Snorkel tour
Entry
The Tiwi Islands are located 80 km north of Darwin. Access is via a 2.5-hour ferry from Darwin with SeaLink NT, or a 20-minute light aircraft flight to Bathurst Island. All visitors must be on a permitted tour or hosted by a resident — permits are arranged through the Tiwi Land Council. Tours operate Monday to Friday, April to November.
Parking & facilities
Parking available at Darwin ferry terminal (Cullen Bay Ferry Terminal) or at Darwin Airport for fly-in tours.
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Permit required (arranged by tour operator). Day tours by ferry or air from Darwin cost approximately AUD $250–$400 per person.
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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