Sim Reef
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.
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.
Nearest Dive Centres to Sim Reef
Dive shops near Sim Reef
View all dive centres in Great Barrier ReefReviews for Sim Reef
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)
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)
Plan & book
Ways to dive Great Barrier Reef, from day trips to liveaboards.
Day trips & courses
via GetYourGuideGuided dives, courses and snorkel trips with instant booking.
Find dive trips in Great Barrier ReefPlaces to stay
via Booking.comHotels and dive resorts near Great Barrier Reef.
Search stays in Great Barrier ReefDive insurance
Most travel insurance excludes or limits scuba. Check what you need before you go.
Dive insurance explainedPartner links: we may earn a commission if you book, at no extra cost to you. How we make money
Where to Stay near Sim Reef
Prices from Booking.com. We may earn a commission at no extra cost to you.
