City of Johannesburg

Johannesburg, also known as eGoli (place of gold), is the largest and most populous city in South Africa. The city is affectionately known as "Jo'burg", "Jozi" and "JHB" by South Africans. Johannesburg is the provincial capital of Gauteng, the wealthiest province in South Africa, and 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 Africa's only officially designated global city (classified as a gamma world city). While often assumed to be South Africa's capital, Johannesburg does not form one of South Africa's three capital cities. Johannesburg does, however, house the South African Constitutional Court - South Africa's highest court.

More info at  en.wikipedia.org