It is South Africa's third-largest park, spanning 280 kilometres of coastline, from the Mozambican border in the north to Mapelane south of the St Lucia estuary, and made up of around 328 000 hectares of pristine natural ecosystems â€“ including swamps, lake systems, beaches, coral reefs, wetlands, woodlands and coastal forests.
The park takes in a 60 kilometre river mouth that creates a huge estuary, Lake St Lucia, running parallel to the coast and separated from the sea by the world's highest forested sand dunes. The lake is part of the St Lucia estuarine system, the largest estuarine system in Africa.
The park incorporates the whole of Lake St Lucia, the St Lucia and Maputaland Marine Reserves, the Coastal Forest Reserve and the Kosi Bay Natural Reserve. The 40 0000 hectare Mkuzi Game Reserve is also in the process of being incorporated into the park.
St Lucia's wide variety of ecosystems and natural habitats provides for an astounding diversity of species in the area. With its lakes, lagoons, freshwater swamps and grasslands, St Lucia supports more species of animal than the better-known and much larger Kruger National Park and Okavango Delta - from the countryâ€™s largest population of hippos and crocodiles to Giant Leatherback turtles, black rhino, leopards, and a vast array of bird and marine life.
According to Living Lakes, more than 530 species of birds use the wetland and other areas of the Lake St Lucia region. "These waters also are graced by 20 000 greater flamingos, 40 000 lesser flamingoes, as well as thousands of ducks. With 36 species, this area has the highest diversity of amphibians in South Africa.
"... Here, and nowhere else in the world, can one find hippopotamuses, crocodiles and sharks sharing the same waters."
In proclaiming the Greater St Lucia Wetland Park a World Heritage Site in 1999, Unesco said: "The interplay of the park's environmental heterogeneity with major floods and coastal storms, and a transitional geographic location between sub-tropical and tropical Africa, has resulted in exceptional species diversity and ongoing speciation.
"The mosaic of landforms and habitat types creates superlative scenic vistas. The site contains critical habitat for a range of species from Africa's marine, wetland and savannah environments."
In 1989, a mining company seeking titanium and other metals sought to bulldoze the dunes along the eastern shore of Lake St Lucia.
In 1996, the South African government followed the recommendations of an environmental assessment in barring the mining proposals - and began work on an integrated development and land-use planning strategy for the entire region. Under the Lubombo Spatial Development Initiative, the governments of South Africa, Swaziland and Mozambique aim to foster sustainable investment and job creation in the area, using the Greater St Lucia Wetland Park as the core.
The variety of natural settings, the abundance of wildlife, and the sheer beauty of the place draw tourists to the area in increasing numbers. There is plenty to do â€“ from fishing, boating and scuba diving to hiking, horseriding, game viewing, whale and bird watching.
The park is also one of South Africa's most popular fishing destinations, lending itself to rock and surf fishing, kite fishing, spear fishing, fly fishing, estuary fishing and deep sea fishing.
There are plenty of hiking trails through the parkâ€“ ranging from a few hours' to a few days' worth â€“ offering the opportunity to see a huge variety of animal and bird life. Accommodation options are extensive, ranging from camping to private game lodges, and including hotels, flats and chalets in the nearby town of St Lucia.
Internationally, there are 812 World Heritage sites, in 137 countries. Africa has 65 sites and South Africa a total of seven - three cultural, three natural and one of mixed cultural and natural heritage.
The other six are Robben Island, the Mapungubwe Cultural Landscape, the Cradle of Humankind, the uKhahlamba Drakensburg Park, the Vredefort Dome and the Cape Floral Region.