Aliwal Shoal

Aliwal Shoal — KwaZulu-Natal, South Africa

Aliwal Shoal is a fossilised sand dune, 5 km off the KwaZulu-Natal coast near Umkomaas, submerged when sea levels rose at the end of the last ice age. The hard substrate has been colonised by corals and sponges over thousands of years, and the resulting reef — irregular, cavelike, with a network of gullies and overhangs — is one of the most shark-rich dive sites in Africa.

The Sharks

The site is most famous for its ragged-tooth sharks (known elsewhere as sand tiger sharks, Carcharias taurus). From June through October, ragged-tooths congregate on the shoal — resting in caves and overhangs, drifting slowly through the gullies, sometimes in groups of a dozen or more. Their appearance — rows of jagged, forward-pointing teeth, large heavily-built bodies — makes them look terrifying. Their behaviour on the shoal is placid. They are ambush predators that expend minimal energy between hunts.

Beyond ragged-tooths, Aliwal Shoal hosts tiger sharks (resident year-round), bull sharks (particularly at the baited shark dives run by operators), blacktip sharks, and hammerhead sharks during the summer months (November–March). The baited shark dives — controversial in some quarters — produce close-up encounters with bull sharks and tigers in the 5–15m range.

The Wreck

The MV Produce, a 105-meter freighter, was deliberately sunk in 2000 at 30 meters adjacent to the natural reef. The wreck is now heavily encrusted with soft corals and serves as an artificial reef habitat — groupers, moray eels, and lionfish in every opening.

Practical Info

• Depth: 6–27m (natural shoal); 30m (MV Produce wreck)
• Difficulty: Intermediate — visibility variable (5–20m); some current
• Access: Shore-based launches from Umkomaas (30 min south of Durban); rough launch conditions possible
• Best season: June–October for ragged-tooth sharks
• Marine life: Ragged-tooth sharks, tiger sharks, bull sharks, reef fish, nudibranchs, turtles