At the heart of the park lies Lake St. Lucia, a vast, shallow estuarine system that breathes with the tides and the rains. Its waters and shores hold around 800 hippopotami and 1,200 crocodiles, one of the densest concentrations of both animals anywhere in Africa. On a boat cruise the hippos surface in pods, eyes and ears breaking the brown water, while crocodiles lie motionless on the banks like fallen logs that occasionally blink. The lake also shelters an astonishing variety of smaller life: twenty-four species of bivalve mollusc alone have been recorded here, a single statistic that hints at the richness underneath. Portuguese survivors of the shipwrecked Saint Benedict glimpsed this coast in 1554, and on the feast of Saint Lucy in 1575 the estuary mouth was christened Santa Lucia, the name it still carries.

Long before any of those names, this was Tsonga land. The Tsonga people lived along the bay for more than a thousand years, building their distinctive woven fish kraals in the shallows and tending a coastline they knew intimately. In the early 1890s the Swiss missionary Henri-Alexandre Junod studied them closely and mapped the region as Tembeland, ruled by the Tembe royal family, its capital set near the St. Lucia bay. The Tsonga homeland, in his account, stretched unbroken from St. Lucia north to Maputo, a single cultural world later carved up by colonial borders. To honor that history is to remember that this protected wilderness was never empty. It was a homeland, lived in and shaped by people for many centuries before it became a park.

The ocean side of iSimangaliso is just as crowded with wonders. Along its beaches, giant loggerhead and leatherback turtles haul themselves ashore through the summer months to lay their eggs in the warm sand, an ancient ritual the park works hard to protect. Offshore, whales and dolphins pass on their migrations, whale sharks drift through now and then, and octopus and squid are everyday sights for divers. The reefs near Sodwana Bay, within the park's boundaries, host some of the most spectacular coral diversity on the planet, brightly colored fish swarming over outcrops in clear, bathwater-warm seas. It is a rare thing for a single protected area to guard both big game on land and living coral in the water, but iSimangaliso does exactly that.

In December 1999, iSimangaliso, then still called the Greater St. Lucia Wetland Park, was inscribed as a UNESCO World Heritage Site, with Nelson Mandela the guest of honor at the ceremony. The park was renamed in 2007 to the Zulu word that captured the place best. Conservation here is an ongoing act of restoration: in December 2013, after 44 years of absence, lions were returned to the wetland, in part as a tribute to Mandela. The protected land keeps growing, too, stitched into a transfrontier conservation network that crosses into Mozambique and Eswatini, and in 2025 the World Heritage area expanded to fold in Mozambique's Maputo National Park. A messenger once struggled to describe this coast. The simplest answer is still the best: it is a miracle, and one people keep choosing to protect.