Corinne’s Reef - Mafia Island

Haylee’s Hideout, just a quick launch from Jimmy Armers Beach, is a prime example of Kaikōura’s cooler water charm. It’s not about grand coral formations here; instead, we love the subtle beauty of a robust kelp forest swaying over rocky channels. Dropping down, you’re often greeted by a surprisingly busy scene, even with average visibility around five metres. We’ve found the best time to explore is an hour or two either side of slack tide, otherwise those currents can pick up. The real magic happens as you weave through the rock formations. Look closely and you’ll spot a collection of cold-water sponges, often vibrant oranges and purples, alongside the striking native New Zealand anemones. It’s a busy feeding ground. We’ve regularly seen schools of juvenile fish darting amongst the fronds, and if you’re patient, you might spot a Pug-nosed Eel peeking from a crevice, or a Girdled wrasse browsing the rocks. This site is perfect for divers who appreciate the intricate details of a temperate ecosystem and enjoy a relaxed, exploratory dive rather than chasing big pelagics. It’s a rewarding spot for photographers too, especially those keen on macro subjects.

Location: Mafia Island, Tanzania, Indian Ocean & East Africa
Coordinates: -7.945100, 39.796200
Type: reef

Marine Protected Area: Mangrove

Best Time to Dive in Mafia Island

The warmest water temperatures in Mafia Island occur in January, averaging 28.8°C. The coolest conditions are in December at 28.8°C.

Monthly Water Temperatures

January: 28.8°C (air: 27.8°C)
February: 28.8°C (air: 28.0°C)
March: 28.8°C (air: 27.8°C)
April: 28.8°C (air: 27.0°C)
May: 28.8°C (air: 26.9°C)
June: 28.8°C (air: 26.0°C)
July: 28.8°C (air: 25.2°C)
August: 28.8°C (air: 25.0°C)
September: 28.8°C (air: 25.3°C)
October: 28.8°C (air: 26.1°C)
November: 28.8°C (air: 27.0°C)
December: 28.8°C (air: 27.7°C)

Nearest Dive Centres to Corinne’s Reef

Marine Life in Mafia Island

Home to 165 recorded species including 94 hard corals, 63 reef fish, 3 sharks & rays, 2 jellyfish, 1 other, 1 whales & dolphins.

Notable Species

Green Turtle (Chelonia mydas)
Allison's Tuna (Thunnus albacares) - Reef Fish
Whale Shark (Rhincodon typus) - Sharks & Rays
Stripy (Katsuwonus pelamis) - Reef Fish
Bigeye tuna (Thunnus obesus) - Reef Fish
Bullet Mackerel (Auxis thazard) - Reef Fish
Tuna (Thunnus alalunga) - Reef Fish
Sperm Whale (Physeter macrocephalus) - Whales & Dolphins
Tail-spot Squirrelfish (Sargocentron caudimaculatum) - Reef Fish
Cauliflower coral (Pocillopora verrucosa) - Hard Corals
Smooth cauliflower coral (Stylophora pistillata) - Hard Corals
Stony coral (Porites cylindrica) - Hard Corals
Stony coral (Porites lutea) - Hard Corals
Larger star coral (Favites pentagona) - Hard Corals
Staghorn coral (Acropora aspera) - Hard Corals
Staghorn coral (Acropora listeri) - Hard Corals
Birdsnest coral (Seriatopora caliendrum) - Hard Corals
Thin birdsnest coral (Seriatopora hystrix) - Hard Corals
Staghorn coral (Acropora polystoma) - Hard Corals
Closed brain coral (Leptoria phrygia) - Hard Corals

Recommended Packing List for Corinne’s Reef

Based on average water temperature of 28.8°C.

Shorty or Rashguard - warm 29°C water needs minimal exposure protection
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