Nine Mile Reef lies roughly 14 km offshore from Tweed Heads, straddling the NSW–Queensland border. This isolated submerged reef features a dramatic rocky ridge, ledges, gutters, and bommies that drop from 12 m to 30 m. It's legendary among local divers and advanced snorkelers for its formidable grey nurse shark aggregations — over 100 have been counted in the "shark pit" gutter during winter. The reef is blanketed in black coral trees, gorgonians, soft and hard corals, sponges and ascidians, supporting a rich subtropical ecosystem. Strong currents and exposed oceanic conditions mean this is strictly for experienced watergoers.
Nine Mile Reef
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Wave Height 0.5 mSwell Period 7.0 sWind Speed 5.1 knPrecipitation 0.0 mmTidal Phase flood
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DANGER: Explicit Risks Present
Nine Mile Reef has hazards marked as danger. Entering the water here means you may face serious risks to your personal safety.
- Strong Ocean Currents danger
Tidal currents can rip at up to 3 knots (approx. 5.5 km/h), making navigation and return to the boat extremely challenging.
The spot
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Community contribution: submitted by Daniel
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High risk: Strong Ocean Currents
Tidal currents can rip at up to 3 knots (approx. 5.5 km/h), making navigation and return to the boat extremely challenging.
Moderate risk: Exposed Offshore Conditions
Located 9 nautical miles offshore, the site is fully exposed to ocean swell and weather. Trips are frequently cancelled unless conditions are exceptionally calm.
Moderate risk: Depth and Drop-offs
The reef top sits around 10–12 m deep and drops to 30 m, with sudden depth changes that can disorient snorkelers.
Low risk: Shark Encounters
The reef is a famous shark aggregation site. Grey nurse sharks are common in winter (over 100 recorded); wobbegongs, leopard sharks, and occasional bronze whalers are present year-round.
Low risk: Barnacle-Infested Reef
The reef surface is covered in sharp barnacles that can cause cuts and abrasions to exposed skin.
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Getting in
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Entry
Nine Mile Reef is located approximately 9 nautical miles (14 km) off the coast of Tweed Heads, near the NSW–Queensland border. Access is by boat only; local charter operators such as Gold Coast Dive Adventures run trips from the Tweed Heads area (approx. 45-minute boat ride). All trips are weather-dependent and subject to cancellation due to swell and currents.
Parking & facilities
Parking is available in Tweed Heads at public car parks and the Tweed Mall area (free timed parking or $2/day undercover). Charter operators typically have designated parking near their departure points.
parking
Charter fees apply — book through local dive/snorkel operators. No direct entry fee as this is an offshore reef.
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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