Last updated July 2026
Motukaroro (Passage Island) lies at the entrance to Whangārei Harbour and forms one of two sites within the Whangārei Harbour Marine Reserve. The 26.2-hectare Motukaroro section protects the island, surrounding reef and seabed, where strong tidal flows support abundant marine life including a notable filter-feeder community on the western point. The reserve was established in 2006 and is managed by the Department of Conservation as a no-take area. Visitors reach the site by road to Reotahi, then access the water from the beach or by kayak or boat for diving and snorkelling. Shags and other seabirds frequent the area, and the combination of currents and protected habitat creates conditions for diverse reef fish and invertebrates.
Practical Information
| Access | Reotahi Road (southern end of McLeod Bay) to Beach Road car park |
| Distance from city | Approx. 28–30 km / 25–30 minutes drive from central Whangārei |
| Entry | Free |
| Activities | Diving, snorkelling, kayaking, swimming, picnicking |
| Tidal currents | Strong with back eddies — best for experienced divers and swimmers |
| Marine reserve rules | No fishing, collecting or removal of marine life (DOC no-take reserve) |
| Managed by | Department of Conservation |
| Established | 2006 |
About Motukaroro Island
Motukaroro sits at the harbour mouth where the inner channel meets open waters. The mix of deeper water, rocky reef and sandy seabed, combined with swift tidal flows, produces a habitat rich in marine life that is distinctive within a harbour setting. The western point features a large community of filter feeders, including brightly coloured anemones and sponges, that thrive in the current-swept conditions.
The marine reserve protects this environment from extraction, allowing invertebrate and fish populations to develop naturally. Divers and snorkellers report good visibility of reef fish such as triplefins and red moki alongside the colourful sessile life on the deeper slopes. The island and nearby shores also support seabirds, with the reserve overall noted for migratory waders.
Strong tidal currents and back eddies are a defining feature of the site. Conditions change with the tide, so visitors must check forecasts and tidal tables before entering the water. The location suits experienced participants more than novices.
Getting There and Access
Drive south from Whangārei along Whangarei Heads Road for approximately 25–30 minutes to McLeod Bay. Turn onto Reotahi Road at the southern end of the bay and continue to the car park at the end of Beach Road. Toilets are available at the car park. The rocky shoreline and nearshore reef are reachable directly from the beach for snorkelling. Reaching the island itself or the western point requires a kayak or boat.
Diving and Snorkelling
The western point of Motukaroro offers the standout dive experience within the reserve, where filter feeders cover the reef in vivid colours. Depths increase toward the deep-water channel on the southern side. Snorkelling is possible from the beach near the car park, where reef fish can be seen in shallower areas. All activities must comply with marine reserve rules; nothing may be collected or disturbed.
What Visitors Often Say
The filter-feeder wall on the western point stands out for its bright sponges and anemones, making it one of the more impressive invertebrate dives in Northland harbour waters.
Snorkelling from the beach near the car park reveals reef fish, though visitors stress checking currents and tides before entering the water as conditions can be strong.
Where to Learn More
Department of Conservation – Whangārei Harbour Marine Reserve: official information on the Motukaroro site, rules, access and marine life.
DOC – Map and boundaries: detailed maps and GPS information for the reserve boundaries.
Frequently Asked Questions
Can I dive or snorkel at Motukaroro?
Yes. Diving and snorkelling are permitted within the marine reserve. The western point filter-feeder community is the main attraction for divers, while snorkelling is possible from the beach near the car park.
Are the currents dangerous?
Strong tidal currents and back eddies occur around the island, especially near the channel. The site suits experienced divers and confident swimmers. Always check tidal conditions and sea state before entering the water.
How do I reach the island?
The island is reached by kayak or boat from the Reotahi car park area. Shoreline snorkelling does not require crossing to the island.
Is parking available?
Yes. A free car park is located at the end of Beach Road, Reotahi, with toilets nearby.
Can I fish in the reserve?
No. The entire Motukaroro section is a no-take marine reserve. Fishing and collecting any marine life are prohibited.
What wildlife can I see?
The area supports diverse reef fish and invertebrates, including sponges and anemones. Seabirds such as shags frequent the island and surrounding waters.
When was the reserve established?
The Whangārei Harbour Marine Reserve, including the Motukaroro site, was established in 2006.
Is the site suitable for beginners?
Strong currents make it more appropriate for experienced participants. Beginners should consider calmer nearby sites or join a guided trip.
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