The garden province of South Africa, KwaZulu-Natal is a subtropical region of lush and well-watered valleys, washed by the warm Indian Ocean. One of the country's most popular tourist destinations, the province stretches from Port Edward in the south to the borders of Swaziland and Mozambique to the north. Its western part is marked by the dramatic Drakensberg mountain range, with several peaks well over 3 000 metres. Between the mountains and the humid, subtropical coastline is savannah grassland, but there are also areas of indigenous forest along the coast. Durban is one of the fastest-growing urban areas in the world. Its harbour is one of the busiest in South Africa and one of the 10 largest in the world.