Startle Reefs
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.
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.
Reviews for Startle Reefs
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)
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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