from Wikipedia Durban:
Durban (Zulu: eThekwini) is the third most populous city in South Africa, forming part of the eThekwini metropolitan municipality. It is the largest city in KwaZulu-Natal and is famous as the busiest port in Africa. It is also a major centre of tourism due to the city's warm subtropical climate and beaches.
According to the 2007 Community Survey, the city has a population of almost 3.5 million. Durban's land area of 2,292 square kilometres (884.9 sq mi) is comparatively larger than other South African cities, resulting in a somewhat lower population density of 1,513 inhabitants per square kilometre (3,918.7/sq mi).