Johannesburg also known as Jozi or Jo'burg, is the largest city in South Africa. Johannesburg is the provincial capital of Gauteng, the wealthiest province in South Africa, having the largest economy of any metropolitan region in Sub-Saharan Africa. The city is one of the 40 largest metropolitan areas in the world and it is one of Africa's only three global cities, the other two being Cairo and Cape Town.
*Excerpt from Wikipedia