Southern Arch
Protected Area
Poor Knights Islands
Why dive here
With 79+ marine species recorded in the area - including blue sharks, dolphins, hammerhead sharks, humpback whales and orcas - Southern Arch offers some of Poor Knights Islands's richest reef diving. Water ranges 15-22°C, warmest January, February, March.
Southern Arch is one of those places you feel before you even splash. The rock itself juts dramatically, a truly massive archway carved by the sea, dwarfing the dive boats. We love diving it on the incoming tide, when the current really starts to pick up; that's when the drummer schools gather, moving like a silver river through the archway itself. You can duck into the calmer pockets, tucked close to the wall, and just watch them flow past. We usually start deep, around 20 metres, where the light takes on that beautiful blue filter. The walls are encrusted with these incredible grey massive sponges and all sorts of colourful invertebrates. Keep your eyes peeled for the smaller stuff too; we've found Spitlure Frogfish hiding amongst the growth and countless nudibranchs. The highlight, for us, is definitely drifting through the arch itself, feeling the push of the water, surrounded by schools of bluefish and parrotfish. It’s a exhilarating experience for competent divers who appreciate a bit of a ride.
Nearest Dive Centres to Southern Arch
Dive shops near Southern Arch
Dive! Tutukaka
Moana Futures Ltd
Northland Dive
DIVE NOW
Reviews for Southern Arch
Conditions
Ocean conditions, forecast and tides for Southern Arch
Southern Arch Ocean Conditions
Monthly averages for Southern Arch, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (-35.84, 174.61) (14km away)
October Averages
Sea Temperature
16°C
60°F · Range: 14.8–17.1°C
Current Speed
11.4 cm/s
Direction: SE (142.1°)
Chlorophyll-a
0.388 mg/m³
Moderate productivity
Salinity
35.44 PSU
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)
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