Cape Town & False Bay

Cape Town sits where the cold, nutrient-rich Benguela Current meets the warmer Agulhas, draping the Cape Peninsula in dense kelp forest and one of the planet's most distinctive temperate dive ecosystems. Most of the coastline falls within the Table Mountain National Park Marine Protected Area (managed by SANParks / Table Mountain National Park), which spans roughly 956 km² across two very different coasts. The Atlantic seaboard runs cold (about 8–14°C, often 10–13°C), with summer south-easterly winds driving upwelling that brings cold but clear water and the best Atlantic visibility — kelp-draped granite reefs such as Atlantis Reef, the Star Walls/Stonehenge wall complex, and the seal colony at Duiker Island off Hout Bay. False Bay, on the eastern side of the peninsula, is warmer (about 13–20°C) and sheltered from the winter north-westerlies, so winter often delivers its clearest water — home to Partridge Point's playful Cape fur seals, the deep Smitswinkel Bay wreck fleet, and shallow shore reefs full of pyjama catsharks, shysharks and common octopus. The destination is famous for the Great African Sea Forest, the only giant bamboo-kelp (Ecklonia maxima) forest on Earth and the setting of the Oscar-winning 'My Octopus Teacher' (2020). Two honest caveats define modern Cape diving: the Miller's Point broadnose sevengill (cow shark) aggregation, once a near-guaranteed encounter, dispersed after orca ('Port and Starboard') predation from around 2015–2017 and sightings there are now rare; and False Bay's great white sharks — once the star of the Seal Island breaching and cage-diving industry — declined sharply between 2015 and 2018 and have been effectively absent since, a documented ecological shift rather than a current attraction. Water is cold year-round: a 7 mm semi-dry or a drysuit is standard, shore diving culture is strong, and which coast you dive is decided by the wind on the day.

• Cape Town's Great African Sea Forest is the only giant bamboo-kelp forest on the planet, stretching roughly 1,000 km along South Africa's southwestern coast; it is the setting of the Oscar-winning documentary 'My Octopus Teacher' (2020), in which cinematographer Craig Foster freedives daily without a wetsuit to follow a wild common octopus through the kelp.
• Much of the diving sits inside the Table Mountain National Park Marine Protected Area — about 956 km² managed by SANParks, with a complex zonation of restricted no-take zones and controlled areas that protect kelp forests, reefs, white sharks, abalone, African penguins and over-exploited linefish such as galjoen.
• False Bay's great white sharks declined steeply between 2015 and 2018 and have been effectively absent since: a peer-reviewed study (Hammerschlag, Fallows et al., Scientific Reports 2019) drew on 6,333 shark sightings and 8,076 predatory attacks recorded at Seal Island over 2000–2018 and documented prolonged periods of complete white-shark absence by 2017–2018, coinciding with the novel appearance of 120 sevengill sharks at the island — frame this as a documented ecological change, not a current attraction.