Great Barrier Reef, Australia
    Starcke River (Ngulun)

    Sim Reef

    Best months: Feb–Mar

    Protected Area

    Starcke River (Ngulun)

    Why dive here

    With 154+ marine species recorded in the area - including hammerhead sharks, sea turtles, tiger sharks and napoleon wrasse - Sim Reef 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

    Sim Reef, for us, is one of those places you go when you’re looking to truly immerse yourself in the GBR’s quieter side. It’s not the flashiest site, no dramatic walls or crazy swim-throughs, but it has this incredible, subtle beauty. We love dropping in on the northern end, drifting slowly over the hard coral bommies that rise from a sandy bottom. You often find a lone Telescopefish here, just hanging, and the Flowerpot and Fluorescence grass corals give the whole scene this soft, almost ethereal glow. The real magic here, though, is in the small stuff. We’ve spent whole dives just watching the Actor Coral Gobies darting between the polyps of a massive Porites colony, or trying to spot the Sneaky Wrasse, which lives up to its name. If you're into macro and don't mind taking your time, Sim Reef is fantastic. We’d suggest going in the late morning, the light penetration really brings out the colours in the yellow scroll corals and makes the whole place feel alive. It’s a gentle dive, perfect for photographers or anyone who just wants to slow down and absorb the reef.

    Safety Notes

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

    Today05:5618:1712h 21m daylightGolden hour 17:49

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    Conditions

    Ocean conditions, forecast and tides for Sim Reef

    Sim Reef Ocean Conditions

    Monthly averages for Sim Reef, 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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