Long Reef Wall

The Wall at Long Reef: Sydney’s Cathedral of Sharks

By ScubaDownUnder Team · 2025-12-11

# The Wall at Long Reef: Sydney’s Cathedral of Sharks

If you’re looking for a dive that screams "classic Sydney" but delivers a punch of adrenaline that feels a world away from the CBD, you need to load up the ute (or the dive boat) and head to the Northern Beaches. specifically, we are talking about **Long Reef Wall** in Collaroy.

This isn't just a rock in the water; it’s a bustling underwater metropolis, a geological wonder, and quite frankly, one of the best spots in New South Wales to hang out with the grey-suited landlords of the ocean the Grey Nurse Sharks.

Grab your regs and let’s descend into the details.

### **Getting In and Out**

Let’s be real for a second, mate. While Long Reef is technically a headland you *could* walk off, diving **The Wall** is strictly a **boat dive** affair.

Could you swim it from shore? theoretically, if you have the stamina of an Olympian and a disregard for your own comfort. The Wall sits a fair way out from the rock platform, and the surface swim would be a nightmare, particularly with the swell that tends to hammer the point.

**The Smart Way:** Most divers launch from **Fisherman’s Beach** at Collaroy. It’s a beach launch, so you’ll be getting your feet wet before you even zip up your wetsuit. Commercial charters run regularly from here, as well as from Manly and sometimes Sydney Harbour (though that’s a longer steam).

* **Entry:** Back-roll off the gunwales. * **Exit:** Standard boat ladder climb. Watch the swell on the ladder; the "Long Reef washing machine" effect can sometimes make re-boarding a bit sporty.

### **The Residents: Teeth, Tentacles, and Technicolour**

This is why you’re here. Long Reef Wall is a biodiversity hotspot, largely thanks to its status as part of the **Long Reef Aquatic Reserve** the oldest of its kind in NSW (established in 1980). Because it's a "No Take" zone in many areas, the fish here get big and bold.

**The Headliners: Grey Nurse Sharks (Carcharias taurus)** This is one of the premier aggregation sites for these ragged-tooth beauties. Despite their fearsome, snaggle-toothed grin, they are the Labradors of the sea placid and majestic. You’ll often find them cruising the gutter at the base of the wall or hovering motionlessly in the current.

**The Support Act:** * **Wobbegongs:** You will lose count. The Spotted and Ornate Wobbegongs are everywhere here, camouflaged against the boulders. Watch where you put your knees! * **Port Jackson Sharks:** Come winter, the PJs swarm the area to breed. You’ll see them stacked like firewood in the crevices. * **Bull Rays:** Massive smooth stingrays (Bull Rays) often glide over the sand line like underwater UFOs. * **The Blue Groper:** The official state fish of NSW. The friendly blue males will likely follow you around looking for a chin scratch (or a sea urchin, which you shouldn't break open for them let nature do its thing!).

**Macro Magic:** Don't just look for the big stuff. The sponge gardens on the top of the wall are a nudibranch nursery. Look for **Red-lined Flabellinas** and the elusive **Frogfish** (Anglerfish) blending perfectly into the sponges.

### **The Terrain: Cathedrals and Apartments**

The topology of Long Reef is fascinating because it’s not just a flat wall; it’s a series of structures.

**The Wall:** The main feature is a low-profile wall that runs roughly North-South. The top of the reef sits at about **10–12 metres**, making it a bright, colourful start to the dive. The wall drops down to a sand line that varies between **15 metres and 25 metres**.

**The Cathedral:** This is the Instagram shot (if you could Instagram underwater). It consists of two massive sloping rocks that lean against each other to form a triangular, church-like open cave. It’s teeming with Bullseyes and Yellowtail, and looking out from inside provides a stunning silhouette against the blue water.

**The Apartments:** Further along, you find a section of stacked horizontal rock slabs that look like... well, apartments. These deep horizontal fissures are the favourite hangouts for the Wobbegongs and crayfish.

### **The Stats**

* **Depth Range:** 10m (top of reef) to 25m (sand line). * **Visibility:** Varies wildly. * **Average:** 10–15 metres. * **Good Days:** 20–30 metres (usually in Winter with westerly winds). * **Bad Days:** <5 metres (after heavy rain or big swells). * **Current:** Can be present, usually running North-South. It’s rarely ripping, but enough to make a drift dive enjoyable.

### **When to Go**

**For the Sharks (Grey Nurse):** The peak season for the Grey Nurse aggregations tends to be **late Summer through Autumn and early Winter**. However, they are year-round residents in smaller numbers.

**For the Visibility:** **Winter (June–August)** is your best bet. The water is colder (dropping to a brisk 16–17°C), but the westerlies flatten the seas and clear up the particulate matter.

**For the Comfort:** **Summer (December–February)** brings warmer water (up to 23°C), but often brings the plankton blooms that drop viz to a green 8 metres.

**Conditions Warning:** Long Reef is exposed. If there is a big Southerly swell or a strong North-East wind chop, the site can be undiveable. Always check the forecast.

### **Aprés Dive & Amenities**

Since you are likely boat diving, your "amenities" are what you bring with you. However, back on land:

* **Boat Ramp:** Fisherman’s Beach, Collaroy. It has toilets and a shower to rinse off the salt. * **Closest Dive Stores:** * **Pro Dive** in Brookvale is just up the road for fills and gear. * **Dive Centre Manly** is a bit further south but services the area daily. * **Refills:** If you're launching from Fisherman's, you'll need to drive to Brookvale or Manly for air. There is no compressor at the boat ramp.

### **A Bit of History**

Long Reef isn't just a pretty face; it’s a geological museum. The headland is composed of **Bald Hill Claystone** (that distinct chocolate-red rock) and **Bulgo Sandstone**, dating back to the Triassic period.

**The Wrecks:** While The Wall itself is a natural reef, the surrounding Long Reef Aquatic Reserve is a graveyard of ships. The most famous nearby is the **SS Myola**, a collier that sank in 1919 off Dee Why. There’s also the **Coolooli** (a bucket dredge scuttled for an artificial reef) and the **Dee Why** ferry. While these aren't part of "The Wall" dive profile, they make the surrounding area a technical diver's playground.

**Fun Fact:** Long Reef was the site of the first documented sighting of the "Blue Ringed Octopus" toxicity in the 1960s (though don't quote me on the date, the little guys have been nasty forever).

**Conclusion** Long Reef Wall is the perfect intermediate dive. It offers the depth and excitement of a boat dive without being an abyss, and the marine life density rivals spots on the Great Barrier Reef just with colder water and more sharks!

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*Planning a NSW dive trip? See our [region-by-region guide to the best places to dive in NSW](https://www.scubadownunder.com/blog/best-places-to-dive-in-nsw) for the full overview of dive sites across the state.*