Solitary Islands

A Morning at the Solitary Islands

When Priya from our BugBitten team rolled backwards off the side of the dive boat at South Solitary Island, she wasn't entirely sure what to expect. The sky was clear, the swell was manageable, and the skipper had given the standard pre-dive briefing with the kind of calm efficiency that suggests he's done this a few hundred times. What Priya wasn't prepared for was the grey. Not the grey of poor visibility or stirred-up sediment — but the grey of sharks. A lot of sharks. Within three minutes of descending to the base of the Shark Gutters, she counted fourteen grey nurse sharks hanging almost motionless in the water column, their bodies angled slightly into a gentle current, their movements unhurried and entirely unbothered by the small cluster of wetsuit-clad humans hovering nearby.

It was one of those underwater moments that resets your sense of scale. Grey nurse sharks are big animals — adults regularly push past two metres — and seeing a congregation of them in shallow, clear water, close enough to notice the texture of their skin, is a different experience entirely from watching documentary footage. There's no dramatic music. There's no narrator. There's just you, your bubbles, and the sharks. Priya spent the better part of forty minutes in that gutter, and by the time she surfaced she had already decided she'd be back on the boat the next morning.

That, in essence, is what the Solitary Islands do to people.

What Makes This Spot Worth Your Time

The Solitary Islands Marine Park stretches along roughly 75 kilometres of New South Wales coastline, taking in a string of rocky outcrops and offshore reefs that sit at a genuinely unusual ecological intersection. The East Australian Current pushes warm, nutrient-rich tropical water southward along the coast, while cooler temperate water occasionally surges up from the south. The result is a collision zone — and in the underwater world, collision zones tend to be extraordinarily productive.

On a single dive at the outer islands, you might hover over a sea fan that would look perfectly at home on a Queensland reef and then turn around to find kelp fronds waving in the surge below you. Species from two entirely different oceanic zones coexist here in a way that marine biologists still find fascinating. The park is officially a Commonwealth Marine Reserve and is managed with conservation as the primary mandate, which means reef condition has remained healthy in ways that aren't always guaranteed along Australia's busy eastern seaboard.

For divers, the headline is undeniably the grey nurse sharks. They gather reliably at South Solitary Island — the outermost and most biologically rich of the group — in numbers that would be remarkable anywhere in the world. But the supporting cast is just as interesting: leopard sharks resting flat on sandy patches, wobbegong carpeting the reef ledges in textured camouflage, blue gropers nosing around your fins, and enormous schools of yellowtail scad and baitfish forming shifting silver walls through the water column. Whale sharks move through the area unpredictably during late summer, and while you cannot plan your trip around them, the possibility adds a certain anticipatory charge to every descent between January and April.

The snorkelling at some of the closer inshore sites is also legitimate — not a consolation prize for non-divers, but genuinely good in its own right.

How the Area Feels

Coffs Harbour is a mid-sized regional city on the NSW Mid North Coast — the kind of place that has a Bunnings and a decent espresso and takes itself neither too seriously nor not seriously enough. It's a working town with a strong surf culture and a steady tourism economy built around the banana industry, the beaches, and increasingly, the marine park. The waterfront is tidy without being precious. The dive operators work out of the marina, which has the functional, salt-stained atmosphere of a place where people actually go to sea rather than simply talk about it.

The surrounding coastline — the Coffs Coast — has a particular quality of light in the early morning that makes the drive down to the marina feel worthwhile even before you've hit the water. Headlands clad in casuarinas and coastal scrub drop directly to rocky platforms, and the sea here has that slightly volatile energy you get whenever there's genuine swell interacting with exposed offshore reefs. If you've done any diving along the Lavender Coast Cycle Route and its adjacent coastal waters further south, you'll notice Coffs sitting at an intriguing transition point — warmer, more tropical in feel, but with enough temperate character to make the marine environment genuinely distinct.

The islands themselves are uninhabited. There's no infrastructure out there — no café, no jetty, no shelter. They're rocky, wave-battered, vegetated with coastal scrub and occupied by nesting seabirds. From the boat they look like the kind of place that doesn't particularly want visitors, which is probably part of why the underwater world has remained so intact.

What to Actually Do Here

Diving South Solitary Island

This is the main event for most visitors, and for good reason. The Shark Gutters at South Solitary sit in five to eighteen metres of water — accessible to Open Water certified divers on a good day — and reliably host the grey nurse shark aggregation from roughly April through to November, with peak numbers typically in winter. The site also features walls, swim-throughs, and a ridge system that channels current and concentrates fish life. On a rising tide with good visibility, it's genuinely one of the better temperate dive sites in the country.

Advanced certification opens up access to the stronger-current sites and deeper sections, and if you're planning to dive the outer reefs on a day with a tidal run, experience with current diving will make the trip significantly more enjoyable.

Snorkelling the Inshore Reefs

Split Solitary and Muttonbird Island — the latter attached to the headland by a short causeway and manageable on your own — offer snorkelling that's well above average. The reef communities here are healthy, the fish life is abundant, and on a calm day the water clarity is very good. Muttonbird Island is also home to one of the most accessible little penguin colonies in NSW, visible at dusk during the breeding season.

Shore-Based Wildlife Watching

Between June and November, humpback whales pass through in consistent numbers during their annual migration. The headlands around Coffs — particularly Muttonbird Island and the various lookouts on the coast road — provide decent vantage points, and close approaches are not unusual. Parks Australia manages the marine park with guidelines around whale approach distances that operators take seriously, so interactions in the water are genuinely respectful rather than performative.

The marine park also supports green and loggerhead turtles, bottlenose dolphins (resident year-round), and occasional visits from orca working the whale migration routes.

Booking a Day Boat

All access to the outer islands is by day boat. There are two or three operators running regular trips from Coffs Harbour Marina, and most offer packages combining two dives with equipment hire. Trips typically leave early — around 7am — and return mid-afternoon, which means you have your evenings free. Book ahead in winter; the grey nurse aggregation is well-known and boats fill up.

When to Go (And When Not To)

Winter — June through August — is the peak season for grey nurse shark numbers at South Solitary, and the water temperature, which dips to around 18°C, keeps the sharks aggregated and reliably visible. Visibility can be exceptional in winter, sometimes pushing 25 metres on a settled day. Pack a 5mm wetsuit minimum; a drysuit if you run cold.

Late summer (January through March) brings warmer water — up to 25°C — and with it the possibility of whale sharks, manta rays, and more tropical fish species on the outer reefs. The trade-off is that increased rainfall can affect visibility, sometimes dramatically. Murky green water after a heavy rain event is genuinely unpleasant for diving, and there's little you can do about it.

Avoid planning dive trips on days forecast with strong southerly swell. The outer islands become inaccessible, or at best unpleasant, when swell exceeds two metres from the south. Check conditions with your operator before booking — they're generally straight with you about whether it's worth going out.

Spring (September to November) is arguably the most balanced time: reasonable water temperatures, clearing visibility, and humpback whales still passing through on the southward leg of the migration.

How to Get There and Nearby Stops

Coffs Harbour has a regional airport with direct flights from Sydney (around one hour), Brisbane (around one hour), and Melbourne. The drive from Sydney is approximately six hours via the Pacific Highway — reasonable as a road trip rather than a slog if you break it up. From Brisbane it's around four and a half hours south.

The marina is a short drive from the town centre; most accommodation in Coffs can arrange early-morning transport, or you can drive yourself. Parking at the marina is available.

If you're building a longer coastal itinerary, the Coffs Coast sits neatly between Port Macquarie to the south and Byron Bay and the Gold Coast to the north. There's a solid argument for spending two or three nights here as part of a broader NSW coastal trip rather than treating it as a day stop. The BugBitten team has covered more places in Coffs Harbour NSW that pair well with a diving trip — beaches, hinterland walking tracks, and the Bellingen valley just inland.

For context on Australia's broader marine park network and what distinguishes a destination like the Solitary Islands from more commercially developed dive sites, Tourism Australia maintains useful regional guides worth checking before you plan a multi-stop east coast trip.

If you're the kind of diver who collects unusual encounters and wants to compare notes on different marine environments, the contrast between the Solitary Islands and somewhere like Christmas Island — with its own extraordinary aggregation species and pure tropical character — is a useful frame for understanding what makes temperate/tropical collision zones so ecologically distinct.

The Not-So-Good Bits

Honest talk: the Solitary Islands are not a guaranteed experience. Visibility is variable enough that a trip on a bad day can be genuinely disappointing — you'll spend forty minutes in green murk wondering where the sharks are. It happens, particularly after rain or in the presence of an easterly swell that stirs up sediment. Operators don't always communicate visibility conditions clearly before you commit, so ask directly and ask specifically.

The boats are day boats — small to medium vessels — and the crossing to South Solitary can be rough on a swell day. If you're prone to seasickness, come prepared with medication taken the night before, not the morning of. The trips are long enough that suffering through the crossing is genuinely miserable.

Currents at the outer sites are real and can be strong, particularly on a spring tide. If you're a newly certified Open Water diver who hasn't dived in current before, a less demanding site might be the better starting point. The operators are experienced and safety-conscious, but it's worth being honest with yourself about your skill level before you book the outer island trip.

Accommodation in Coffs Harbour ranges from adequate to fine — it's not a luxury destination. Don't arrive expecting boutique hotel infrastructure; you'll be comfortable but not pampered.

Final Word from the BugBitten Team

The Solitary Islands don't have a marketing machine behind them, which is actually part of what makes them worth talking about. This is an accessible, legitimate, ecologically serious dive destination sitting a few hours from both Sydney and Brisbane that most people outside the diving community haven't heard of. The grey nurse shark aggregations at South Solitary are among the most reliable and accessible shark dives in the country — no cage, no bait, no performance. Just sharks doing what sharks do, in their own habitat, with you as a respectful observer.

It requires some planning, some flexibility around conditions, and a tolerance for the unglamorous business of early mornings and seasickness tablets. But the rewards are the kind that stay with you — the particular quiet of being in the water with large animals that are entirely indifferent to your presence, the biodiversity that makes no obvious sense until you understand the currents, and the satisfaction of visiting a place that hasn't been smoothed down for easy consumption.

Priya was back on the boat the next morning. Both subsequent dives were good. One was exceptional.

That's the Solitary Islands in a nutshell.