Blue Lagoon is a cherished dive and snorkel site off Green Island, a lush coral cay on the Great Barrier Reef just 27 km northeast of Cairns. Set in stunningly clear, shallow waters (max depth ~8-10 m), the site features a mosaic of sandy patches, coral bommies, and spur-and-groove formations that attract a dazzling array of marine life. Its sheltered lagoon-like conditions and excellent visibility make it a favourite for beginning snorkelers and experienced divers alike, with turtles, reef sharks, and rays commonly spotted cruising the calm waters.
Blue Lagoon (Green Island dive site)
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Showing last known conditions
Wave Height 0.0 mSwell Period 6.4 sWind Speed 1.8 knPrecipitation 8.4 mmTidal Phase flood
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Community contribution: submitted by Daniel
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Low risk: Marine stingers (box jellyfish / Irukandji)
Stinging marine stingers (box jellyfish and Irukandji) are present in tropical waters. Swimmers should wear protective stinger suits during the season.
Low risk: Tidal currents
Currents can pick up around the edges of the reef and near the channel, especially during changing tides.
Low risk: Boat traffic
Boat traffic from dive charters, ferries, and private vessels in the vicinity of Green Island.
Low risk: Sharp coral
Coral formations can be sharp; contact may cause cuts or abrasions.
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Getting in
Boat
Entry
Blue Lagoon is a dive/snorkel site off Green Island, accessible via 45-60 minute catamaran transfers from Cairns Reef Fleet Terminal. Most visitors reach it as part of a guided snorkel tour or dive charter that departs daily from Cairns.
Parking & facilities
Paid parking available at Cairns Reef Fleet Terminal precinct. Arrive early as spaces fill quickly during peak season.
Day trip packages from Cairns range from AUD $120-$200 per person, usually including snorkel gear, lunch, and reef transfers.
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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