Cabbage Tree Island
Port Stephens, NSW
Diving Cabbage Tree Island Port Stephens
By ScubaDownUnder Team · 2025-09-29
# Diving Cabbage Tree Island Port Stephens
Cabbage Tree Island sits just off the entrance to Port Stephens, a sanctuary for marine life and one of the most rewarding intermediate dive sites in New South Wales. This island is more than just a rock outcrop on the horizon. It is a marine reserve, a haven for the threatened grey nurse shark, and a place where divers can explore sponge gardens, swim-throughs and sheer walls alive with colour.
## The Setting
Port Stephens is known for its sweeping bays and rugged headlands, but Cabbage Tree Island holds a special place. Just a short boat ride from Nelson Bay, the island rises dramatically from the sea, its steep cliffs plunging straight into clear water. Beneath the surface the geology continues, with rocky ridges, boulders and ledges forming a labyrinth of habitats.
Access is by boat only, and most trips are run from Nelson Bay. Conditions can vary with swell and current, which is why the site is recommended for intermediate divers. On the right day though, the diving is nothing short of spectacular.
## Getting There
Reaching Cabbage Tree Island starts with travelling to Nelson Bay, the main gateway to diving in Port Stephens. From Sydney, it is a 2.5 to 3 hour drive north via the M1 Pacific Motorway, turning off towards Nelson Bay at Williamtown. Newcastle Airport is the closest flight hub, only 30 minutes’ drive away.
Once in Nelson Bay, all dives to Cabbage Tree Island are boat based. Most charters depart from d’Albora Marina in the heart of Nelson Bay township. The boat trip out takes around 15 to 20 minutes depending on conditions, with the island visible from the marina as you head towards the open ocean.
## The Dive Experience
Descending into the blue, visibility can stretch up to 20 metres in summer months. The first thing divers notice is the abundance of fish life. Schools of yellowtail and sweep swirl around the rocks, while bream and drummer patrol the shallows.
Cabbage Tree Island has multiple dive spots. The northern side offers sheltered walls draped in sponges and soft corals, while the southern side has more exposed terrain with surge channels and caves. Swim-throughs cut through the island’s underwater ridges, giving divers a sense of exploration.
One of the highlights is the sponge garden. Bright orange, pink and purple sponges cover the rocks, contrasting with feather stars and gorgonians. Nudibranch lovers will find plenty to photograph here, with species scattered across the reef.
## Marine Life Encounters
The island is part of the Port Stephens–Great Lakes Marine Park, and it shows in the health of its ecosystem. Grey nurse sharks are the signature species. These gentle giants often cruise slowly past divers, their toothy smiles belying a placid nature. Encounters are usually calm and unhurried, making for unforgettable moments.
In addition, divers can spot wobbegongs resting on ledges, blue groupers following curiously, and giant cuttlefish showing off their colour-changing displays. In summer, pelagics like kingfish and bonito sometimes sweep through. Turtles are also occasional visitors.
The island is also a seabird sanctuary, with little penguins nesting onshore. While you will not see them underwater, it is a reminder of the rich biodiversity tied to this tiny island.
## Local Dive Operators
* [**Feet First Dive**](https://feetfirstdive.com.au/)– well known for small group charters and personalised service, operating out of d’Albora Marina.
All operators provide tanks, weights and guided dives. Full rental gear is available for those travelling light, and most also offer refresher courses for divers who have been out of the water for a while.
## Conditions and Requirements
Depths range from 10 to 25 metres, giving options for varying experience levels, but surge and current are common. For this reason, divers are advised to have solid buoyancy control and confidence in open water. Boat entries and exits require care, especially when swell wraps around the island.
Water temperatures range from 17°C in winter to 24°C in summer, so a 5mm wetsuit or thicker is recommended outside the warmest months.
## Conservation and Respect
Cabbage Tree Island is a declared nature reserve, and strict protections are in place. Landing on the island is prohibited to protect the nesting seabirds, and divers are asked to follow marine park rules. This means no fishing, no collecting and careful finning to avoid damaging the sponge gardens.
The protection has allowed the marine life to flourish, making every dive here a privilege.
## Narrative Impressions
Diving Cabbage Tree Island is like stepping into a preserved slice of ocean wilderness. The sense of drama as the island looms above, the anticipation of seeing a grey nurse glide past, and the kaleidoscope of colour in the sponge gardens all combine to create an experience that lingers long after surfacing.
It is not a site for a casual splash, but for those willing to take on the intermediate challenge, the rewards are immense. Divers come away with a renewed respect for the resilience and beauty of the marine environment.
## Final Thoughts
Cabbage Tree Island delivers a blend of adventure and tranquillity that is rare. The site demands attention to conditions and respect for its protected status, but offers encounters and scenery that rank among the best on the New South Wales coast. For intermediate divers looking for a memorable trip, it should be high on the list.
### Sources
* [Wiki– Cabbage Tree Island Nature Reserve](https://en.wikipedia.org/wiki/Cabbage_Tree_Island%2C_New_South_Wales) * [Port Stephens](https://www.portstephens.org.au/) * [Lets Go Adventures, Nelson Bay Diving](https://www.letsgoadventures.com.au/) * [Feet First Dive](https://feetfirstdive.com.au/) - [Dive Planet](https://www.diveplanit.com/dive-site/cabbage-tree-island/)
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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.*