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The dive site Zigzag Reef is an offshore rocky reef in the Castle Rocks restricted zone within the Table Mountain National Park Marine Protected Area on the False Bay coast of the Cape Peninsula, near Cape Town in the Western Cape province of South Africa.


Detail map of the dive site at Zigzag Reef
Dive site map of the Pie Rock, Outer Castle Giant's Castle and Zigzag reefs

This is one of the deeper reef sites within a short distance from the popular False Bay launching areas.


  • S34°14.362' E018°29.275' 1 Zigzag Reef (20 m pinnacle)

This site is almost entirely inside the Castle Rocks Restricted Zone of the Table Mountain National Park Marine Protected Area (2004). A permit is required.


The name "Zigzag" was given by Pisces Divers. The site was first surveyed in detail in August 2020, but was already shown as a patch of reef on the Council for Geoscience side-scan sonar survey made some years previously (dotted red outlines on the maps).


Maximum depth is about 32 m, and the top of the pinnacle is about 20 m. (Average depth of a dive is likely to be about 25 m.)


Visibility is likely to be similar to the other reefs in the Miller's Point area, but may be better due to less surge at depth, but darker, due to greater average depth.


The reef is quite compact, being roughly 70 m from east to west, and 50 m from north to south, with an irregular perimeter and surrounded by fairly flat sand and shelly detritus. The group of tall pinnacles is to the south-west of the reef, and is made up of a tight group of massive tall outcrops surrounded to the north and east by lower boulders and outcrops.

Geology: Pre-Cambrian Granite of the Peninsula pluton, surrounded by mostly fine quartzitic sand and mounds of shell fragments.


The site is exposed to swell from the south and south-east, and to wind chop from the north-west, so should be dived in westerly swells, and preferably in moderate winds.

The site will generally be at its best in winter but there are also occasional opportunities at other times of the year.

Get in[edit]

Access is by boat. The site is about 1.9 km from Miller's Point slipway, or 9.2 km from Simon's Town jetty


Marine life[edit]


Suggested routes[edit]

Stay safe[edit]





Back to Diving the Cape Peninsula and False Bay#Castle Rocks

This dive guide to Zigzag Reef is a usable article. It has information on location and equipment as well as some complete entries on what to see. An adventurous person could use this article, but please feel free to improve it by editing the page.