Motukaroro (Passage Island) sits at the mouth of Whangārei Harbour, protected as part of the Whangārei Harbour Marine Reserve. The 26.2-hectare reserve covers the island and the surrounding reef and sandy seabed, including a spectacular filter-feeder wall on the western point — anemones and sponges in brilliant colours that make it a notable dive site for those willing to make the journey to the Whangārei Heads. Shags and herons nest on the island itself. Swimming, snorkelling, kayaking, and diving are all possible here.
Practical Information
| Access | Reotahi Road (from McLeod Bay) → Beach Road → car park |
| Distance from city | Approx. 30 km from central Whangārei |
| Entry | Free |
| Activities | Swimming, snorkelling, diving, kayaking, picnicking |
| Tidal currents | Strong — more suitable for experienced divers and swimmers |
| Marine reserve rules | No fishing or collecting — DOC marine reserve |
| Managed by | Department of Conservation |
About the Reserve
Motukaroro/Passage Island takes its position at the harbour entrance, where the inner harbour channel meets the open waters of the Whangārei Heads. The combination of tidal movement, rocky reef, and sandy seabed creates a habitat of exceptional marine diversity. The island provides nesting ground for shags and herons — the trees visible from shore often hold roosting birds year-round.
The marine highlight of the reserve is the western point of the island, where a large colony of filter feeders — sea anemones and sponges — covers the reef in vivid colour. The variety and density of invertebrate life here reflects the protection the marine reserve has provided since its establishment. Divers who reach this section of reef describe it as among the best invertebrate diving available in the Northland harbour environments.
Strong tidal currents and back eddies are a feature of the site — the location at the harbour mouth means significant water movement through the tidal cycle. This makes the reserve more suitable for experienced divers and confident swimmers. Conditions should be checked before visiting and the tidal state factored into any water-based activity.
Getting There
From Whangārei, drive approximately 30 kilometres south along Whangarei Heads Road toward McLeod Bay. From the southern end of McLeod Bay, take Reotahi Road and continue along Beach Road to the car park area. The reserve is accessed from this point — the island itself is reached by water (kayak or boat), while the rocky shoreline and snorkelling areas are accessible from the beach near the car park.
What visitors say
“The filter feeders on the western point are genuinely spectacular — bright orange and purple sponges, anemones everywhere. One of the more impressive dives I’ve done in the north.” — TripAdvisor diver
“A beautiful spot near the end of the Heads road. We snorkelled off the beach near the car park and saw good reef fish. Check currents before you jump in — they can be strong.” — visitor review
Where to Learn More
Useful links
DOC — Whangārei Harbour Marine Reserve — official reserve information including Motukaroro section
Environmental Marine Reserves — Whangārei Harbour — marine ecology background and reserve detail
Frequently Asked Questions
Can I dive at Motukaroro/Passage Island?
Yes. Diving and snorkelling are permitted — the reserve protects the marine life, not restricts access to the water. However, collection of anything from the reserve is prohibited. The western point filter-feeder wall is the most notable dive site.
Are the currents dangerous?
Strong tidal currents and back eddies occur around Motukaroro, particularly near the channel between the island and the shore. The site is recommended for experienced divers and swimmers. Always check tidal conditions and sea state before entering the water.
How do I get to the island itself?
The island is accessed by kayak or boat. The rocky shoreline and nearshore reef are accessible for snorkelling from the beach near the Beach Road car park without needing to paddle to the island.
Is there parking at Motukaroro?
Yes. There is a car park at the end of Beach Road, Reotahi, from which the reserve is accessed.
Can I fish near the island?
No. The entire Motukaroro section of the marine reserve is a no-take zone. Fishing and collecting are prohibited throughout.
What wildlife is on the island?
Shags and herons nest on Motukaroro. The surrounding reef supports a wide variety of fish species. The western point is particularly notable for its sea anemone and sponge populations.
Motukaroro/Passage Island is part of the Whangārei Harbour Marine Reserve. The Reotahi Coastal Walkway runs near the access road and makes a good addition to any visit to this end of the Heads.