Johannesburg

Johannesburg, colloquially known as Jozi, Joburg, or "the City of Gold", is the capital city of the province of Gauteng and the largest city in South Africa. In 2022 (the year of the most recent census), the City of Johannesburg Metropolitan Municipality had a population of 4,803,262, and the wider metropolitan area a population of 15,099,422, making it one of the 100 largest urban areas in the world. It is also the seat of the country's highest court, the Constitutional Court. Situated on the mineral-rich Witwatersrand, the city has long been at the epicentre of the international mineral and gold trade. The richest city in Africa by GDP and private wealth, Johannesburg functions as the economic capital of South Africa and is home to the continent's largest stock exchange, the Johannesburg Stock Exchange.

From the Wikipedia article Johannesburg, CC BY-SA 4.0.