Great Barrier Reef, Australia
    Annan River

    Startle Reefs

    Best months: Feb–Mar

    Protected Area

    Annan River

    Why dive here

    With 154+ marine species recorded in the area - including hammerhead sharks, sea turtles, tiger sharks and napoleon wrasse - Startle Reefs offers some of Great Barrier Reef's richest reef diving. Water ranges 24-30°C, warmest January, February, March.

    Best timeFeb–Mar
    WetsuitNo wetsuit needed, or a rash guard
    Marine lifeHammerhead Sharks, Sea Turtles, Tiger Sharks and Napoleon Wrasse · 154+ species recorded
    Water24-30°C · warmest January, February, March
    CharacterReef dive
    StandoutExceptional marine biodiversity

    Startle Reefs, for us, is a masterclass in subtlety. You won't find the massive pelagics here that some of the outer walls boast. Instead, we love it for its intricate coral formations. Think delicate fluorescence grass coral glowing under your torch, interspersed with towering staghorn and robust hump corals. It’s a site for slowing down, for getting up close with the smaller residents. Look for the black sea cucumbers inching along the sandy patches and the flashes of pinkfish darting between the branches. We’d suggest a late morning dive, after the sun has warmed the water but before any afternoon chop picks up. It’s not a deep site, making it perfect for longer bottom times and really soaking it all in. Divers who appreciate macro life and aren't chasing big fish thrills will find themselves completely at home here.

    Safety Notes

    Strong currents typical this month (avg 30 cm/s). Good buoyancy control essential.

    Today05:5518:1612h 22m daylightGolden hour 17:48

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    Conditions

    Ocean conditions, forecast and tides for Startle Reefs

    Startle Reefs Ocean Conditions

    Monthly averages for Startle Reefs, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (-15.65, 145.72) (5km away)

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    October Averages

    Sea Temperature

    26°C

    80°F · Range: 24.5–29°C

    Current Speed

    30.07 cm/s

    Direction: S (183.8°)

    Chlorophyll-a

    0.057 mg/m³

    Very clear (oligotrophic)

    Salinity

    35.08 PSU

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)

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