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The Indian Ocean Coastal Belt is the warm, humid strip that runs from the Eastern Cape up the KwaZulu-Natal coast into Mozambique: dune forest, palms, sugar cane and subtropical bush, with the warm Agulhas current offshore keeping the water swimmable in every month of the year. It is the greenest and most tropical-feeling part of South Africa and the least like the rest of it.
The far northern end is the best of it. iSimangaliso Wetland Park runs for most of the coast north of St Lucia and is a World Heritage Site that holds estuaries, lake systems, dune forest and the country's only coral reefs at Sodwana Bay. Loggerhead and leatherback turtles come ashore to nest on these beaches in summer, from about November to February, and the hatchlings follow weeks later.
Winter, May to August, is the best travelling weather: dry, warm, and the least humid time of year, and it overlaps with the whale migration offshore. Summer is hot, wet and the turtle season. Stays run from north coast towns like Ballito and Umhlanga to the wetland park villages at St Lucia and Sodwana and the forest lodges behind the dunes.