Portuguese seafarers in the 15th century named this place Ilha da Fera -- Island of Wild Creatures. They were not exaggerating. The modern name comes from Samson Dyer, an American emigrant who arrived at the Cape Colony in 1806 and took up residence on the island, where he made his living collecting guano and selling it to mainlanders as fertilizer. It was a lonely, reeking existence on a rock surrounded by seals and seabirds, but guano was valuable, and Dyer apparently made it work. The island still bears his name, though the guano trade has long since ended and the island is now closed to the general public.

Dyer Island is home to approximately 5,000 African penguins -- a number that sounds healthy until you consider the trajectory. The African penguin population has crashed by more than 95 percent over the past century, driven by overfishing of their prey species, habitat destruction, and oil spills. The colony on Dyer Island is one of the larger remaining breeding populations, but "larger" is relative when the species as a whole is classified as endangered. The penguins share the island with 48 bird species, of which 21 breed on the islands. African oystercatchers, bank cormorants, Cape cormorants, and multiple species of tern nest among the rocks. The Galjoen, South Africa's national fish and an endangered species, swims in the surrounding waters.

The shallow channel between Dyer Island and Geyser Island became famous as one of the best places in the world to see great white sharks. The concentration of seals on Geyser Island creates an irresistible hunting ground, and for years cage-diving boats launched from Kleinbaai to bring tourists face-to-face with the sharks through steel bars. The industry brought international attention and tourism revenue to Gansbaai, a small fishing town that had few other economic engines. The great white shark population along this coast has fluctuated in recent years, with some seasons producing far fewer sightings than others, a shift marine biologists are still working to understand.

In 1988, Dyer Island and Geyser Island were designated as Provincial Nature Reserves. In 2019, the combined island complex received Ramsar status, recognizing the wetland habitat as internationally significant. The reserve also includes Quoin Rock, a third islet that lies further offshore near Quoin Point Nature Reserve and Agulhas National Park. The location matters: these islands sit near the zone where the cold Benguela current of the Atlantic meets the warm Agulhas current of the Indian Ocean, creating nutrient-rich upwellings that support the entire food chain from plankton to apex predators. The islands are managed by CapeNature, and no public access is permitted.

You cannot set foot on Dyer Island, but you can experience it from the water. Boat-based tours from Gansbaai and Kleinbaai offer views of the seal colony, penguin habitat, and marine birdlife without disturbing the breeding populations. On a good day, the noise alone is overwhelming -- tens of thousands of seals bellowing, penguins braying (they were once called jackass penguins for the sound), and seabirds screaming as they wheel above the rocks. From the air, the islands appear as two dark smudges surrounded by a halo of white surf, the shark-patrolled channel a strip of turquoise between them. It is a small world, this reserve complex, but its density of life -- from microscopic plankton to five-meter sharks -- rivals anywhere on the African coast.