Shark Alley - Cape Town & Western Cape

We love Three Sisters for its genuine sense of drama. Off Grand Cayman’s East End, it’s not just another reef; it’s a geological showstopper with three colossal coral pinnacles – Agatha, Bertha, and Cleo – that absolutely dwarf you. The mooring pin drops you right near an open-topped canyon, a natural underwater highway that leads you straight to the first formation. Follow the canyon wall and feel the shift in pressure as you descend, watching schools of Doctorfish spiral around the structures. Our favourite moment is always finning past Cleo, the third pinnacle, which leans dramatically at 21m. It feels like a leaning tower of coral, draped in Lamarck's sheet coral and Great star coral. Look closely in the crevices for Mottled Conger Morays or the shy Dark-spotted Snake Eel. The average visibility here, around 20m, really lets you appreciate the sheer scale of these formations, and we often see Nassau groupers hovering in the blue. It’s a site that suits divers who appreciate impressive reef architecture and don't mind a gentle current, which often brings in Blue Runners. We’d suggest going early in the morning to catch the light filtering through the pinnacles, creating incredible shadows on the sand. It’s a site that feels epic, like exploring an ancient underwater city.

Location
Cape Town & Western Cape, South Africa, Indian Ocean & East Africa
Coordinates
-34.236000, 18.477000
Type
reef

Marine Protected Area: Table Mountain National Park Marine Protected Area

Best Time to Dive in Cape Town & Western Cape

The warmest water temperatures in Cape Town & Western Cape occur in January, averaging 18.9°C. The coolest conditions are in December at 18.9°C.

Monthly Water Temperatures

  • January: 18.9°C (air: 20.8°C)
  • February: 18.9°C (air: 20.7°C)
  • March: 18.9°C (air: 19.5°C)
  • April: 18.9°C (air: 17.3°C)
  • May: 18.9°C (air: 15.8°C)
  • June: 18.9°C (air: 15.0°C)
  • July: 18.9°C (air: 13.2°C)
  • August: 18.9°C (air: 13.2°C)
  • September: 18.9°C (air: 13.9°C)
  • October: 18.9°C (air: 16.5°C)
  • November: 18.9°C (air: 17.8°C)
  • December: 18.9°C (air: 19.3°C)

Nearby Dive Sites in Cape Town & Western Cape

Nearest Dive Centres to Shark Alley

Marine Life in Cape Town & Western Cape

Home to 271 recorded species including 176 reef fish, 45 sharks & rays, 28 whales & dolphins, 5 hard corals, 4 other, 4 octopus & squid.

Notable Species

Recommended Packing List for Shark Alley

Based on average water temperature of 18.9°C.

  • Wetsuit (3-5mm) - comfortable for 19°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