The SS Yongala is widely regarded as one of the world's greatest wreck dives. This passenger steamer sank in a cyclone in 1911 and now rests at 14–30 m, completely encrusted with corals and teeming with giant grouper, bull sharks, sea snakes, and manta rays. Strong currents keep the site nutrient-rich and visibility high, but they also demand experience.
Stingray City in the North Sound of Grand Cayman is one of the world's most famous and visited marine encounters — a shallow 3 m sandbar where dozens of southern stingrays have been conditioned to interact closely with divers and snorkellers who offer them food. The rays slide over hands and bodies and the gentle, almost dreamlike experience is perfect for beginners, families, and non-divers alike. Night dives reveal nurse sharks hunting the same sand.
Aliwal Shoal is a fossilised sand dune reef 5 km off Umkomaas on the KwaZulu-Natal south coast, internationally renowned for its aggregations of ragged-tooth sharks (grey nurse) sheltering in the caves and gutters between June and November. Oceanic blacktip sharks, bottlenose dolphins, humpback whales (winter), and large potato bass make every dive eventful, while the shoal's twin peaks — Cathedral and the Pinnacles — offer dramatic topography at 5–32 m. Boat entry through the surf is standard.
Colombia Shallows forms the upper section of the Colombia reef complex at the southern end of Cozumel and offers one of the island's most diverse fish experiences in just 8–20 m. Huge aggregations of yellowtail snapper, French angelfish, and spotted moray eels occupy every crevice in the spur-and-groove formations, and the large sandy channels between the spurs are reliable hunting grounds for southern stingray. It is equally popular for snorkelling and recreational diving.
The outermost of the Ribbon Reefs, this site features a dramatic vertical wall on the ocean-facing side descending past 30 m, festooned with sea whips, gorgonians, and nudibranchs. The sheltered inner lagoon side is perfect for beginners with sandy slopes hosting garden eels and blue-spotted rays. Minke whale encounters are possible here between June and August.