Johannesburg also known as Jozi, Jo'burg, Joni, eGoli or Joeys, is the largest city in South Africa, by population. 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 50 largest metropolitan areas in the world, and is also the world's largest city not situated on a river, lake, or coastline. It claims to be the lightning capital of the world, though this title is also claimed by others.While Johannesburg is not one of South Africa's three capital cities, it is the seat of the Constitutional Court, which has the final word on interpretation of South Africa's new post-Apartheid constitution. The city is the source of a large-scale gold and diamond trade, due to its location on the mineral-rich Witwatersrand range of hills. Johannesburg is served by O.R. Tambo International Airport, the largest and busiest airport in Africa and a gateway for international air travel to and from the rest of Southern Africa. More recently Lanseria International Airport has started international flights, and is situated conveniently on the opposite side of the metropolis.

Provided by Wikipedia