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.
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.
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
- 1 Miller's Point slipway
- 2 Miller's Point tidal pool
- 3 Murphy's
- 4 Miller's Point - Rumbly Bay
- 5 Boat Rock
- 6 Festival Pinnacle
- 7 Fan Reef
- 8 Shark Alley
- 9 Pyramid Rock
- 10 Phone reef
- 11 Outer Castle
- 12 Castle Rocks North Side
- 13 Pyramid Reef - Castle Pinnacles
- Pyramid Reef - Sansui Reef
- 14 Giant's Castle
- 15 North Pie Rock Reef
- 16 Castle Rocks Point Reefs
- 17 South Pie Rock Pinnacles
- 18 Inner Castle
- 19 West Pie Rock Reef
- 20 East Pie Rock Reef