Johannesburg's suburbs are the product of extensive urban sprawl and are regionalised into north, south, east and west, and they generally have different personalities. While the Central Business District and the immediate surrounding areas were formerly desirable living areas, the spatial accommodation of the suburbs has tended to see a flight from the city and immediate surrounds. The inner city buildings have been let out to the lower income groups and illegal immigrants and as a result abandoned buildings and crime have become a feature of inner city life.
Johannesburg
Johannesburg 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.
Johannesburg once again includes Soweto, which was a separate city from the late 1970s until the 1990s. Originally an acronym for "SOuth-WEstern TOwnships", Soweto originated as a collection of settlements on the outskirts of Johannesburg populated mostly by native African workers in the gold mining industry. Eventually incorporated into Johannesburg, the apartheid regime (in power 1949 - 1994) separated Soweto from the rest of Johannesburg to make it a completely Black area. Lenasia is also part of Johannesburg.