4 mile reef - Goat Island & Hauraki Gulf

Forget the wrecks for a minute. Castaway Island’s house reef, just a two-minute boat ride from the shop, is where we head when we need a reset. It’s a gentle, sandy slope, peaking at 5m, scattered with small coral heads. If you slow down, properly slow down, this place comes alive. We’re talking pipefish: bluestripes, messmates, all tucked into the sand. You’ll spot flounder eyes peeking out, and we’ve found some truly tiny nudibranchs here, often less than a centimetre. It’s a macro heaven, perfect for photographers who like to get low and close. We’ve even seen banded sea kraits hunting through the coral, a sleek ribbon of black and white against the sandy bottom. Visibility averages 13m, which is plenty for this kind of close-up work. It’s our pick for a chill afternoon, a great way to ease back into diving, or just to spend an hour focusing on the small wonders.

Location
Goat Island & Hauraki Gulf, New Zealand, Australasia
Coordinates
-38.727400, 176.069200
Type
reef
Maximum Depth
5-20m

Best Time to Dive in Goat Island & Hauraki Gulf

The warmest water temperatures in Goat Island & Hauraki Gulf occur in February, averaging 22.4°C. The coolest conditions are in August at 14.1°C.

Monthly Water Temperatures

  • January: 21.4°C
  • February: 22.4°C
  • March: 21.8°C
  • April: 19.8°C
  • May: 17.4°C
  • June: 15.3°C
  • July: 14.1°C
  • August: 14.1°C
  • September: 14.7°C
  • October: 16.3°C
  • November: 18.5°C
  • December: 20.3°C

Nearby Dive Sites in Goat Island & Hauraki Gulf

Nearest Dive Centres to 4 mile reef

Marine Life in Goat Island & Hauraki Gulf

Home to 77 recorded species including 43 reef fish, 11 sharks & rays, 3 whales & dolphins, 3 crabs & lobsters, 3 other, 3 sea snails & nudibranchs.

Notable Species

Recommended Packing List for 4 mile reef

Based on average water temperature of 18.0°C, currents 2 cm/s.

  • Wetsuit (3-5mm) - comfortable for 18°C water
  • Mask - essential for every dive
  • Fins
  • BCD - buoyancy compensator
  • Regulator - your most safety-critical piece of gear
  • Dive Computer - tracks depth, time, and NDL
  • Surface Marker Buoy (SMB) - essential for boat pickups
  • Dive Torch - useful for crevices and colour at depth
  • Underwater Camera - capture your diving memories

Frequently Asked Questions

What is the typical depth range for diving at 4 Mile Reef in Busselton?
The provided data is for 4 Mile Reef near Goat Island in New Zealand, not Busselton. The maximum depth for diving at 4 Mile Reef is 18m, though the easy shore entry on sand/stone extends down to 30m+. Divers can expect to explore depths up to 18m at this site.
What kind of marine life and coral can divers expect to see at 4 Mile Reef?
Divers at 4 Mile Reef can expect to encounter abundant marine life, including Koura, rainbow trout, and brown trout. While the site is rich in fish species, the provided data does not specify the presence of coral. For more information on marine species, visit our wildlife database.
How challenging is diving at 4 Mile Reef, and is it suitable for beginner divers?
Diving at 4 Mile Reef is classified as intermediate difficulty. While it is an easy site to navigate, its intermediate rating suggests it is best suited for divers with some prior experience rather than absolute beginners.
When is the best time of year or day to dive 4 Mile Reef for optimal conditions?
For optimal diving conditions at 4 Mile Reef, it is best to dive when wind conditions are less than 8 knots and from an easterly (offshore) direction. The provided data does not specify a particular time of year or day, but focusing on these wind conditions will enhance your dive experience. For general advice on dive timing, see our when to dive guide.
What scuba diving certifications are required to dive at 4 Mile Reef?
The provided data for 4 Mile Reef does not specify any particular scuba diving certifications required to dive at this site. Divers should always ensure they are certified for the conditions and depth of their planned dive.
What are the typical current and visibility conditions like at 4 Mile Reef?
At 4 Mile Reef, the average visibility is 14m, with water clarity generally good on the sand area, though some silt may be present on the drop-off. The provided data does not include specific information regarding typical current conditions at this site.