In Johannesburg City, there are about six million trees. It is often said to be the largest man-made forest in the world. In the late nineteenth century, the city began planting trees to provide wood for the mining industry. A German immigrant began developing forest estates in northern Johannesburg. He called these areas Sachsenwald and later, it became a suburb. Over the years, white residents kept many of the original trees and planted new ones. The city's successive city councils encouraged this tradition.
The inner-city and southern suburbs of the city are largely blue collar neighborhoods. The southern suburbs of the city are closer to the townships. Some of these areas have a higher population density. The city is home to diverse cultures and neighborhoods. The diversity of Johannesburg's population makes the city a great place to live. It is the capital of the Gauteng Province. It is home to several universities and other institutions, including the University of Johannesburg.
The city has a diverse population: blacks make up 73% of the population, while whites comprise the remaining 18%. There are also many coloured people and Asians, which makes up 4% of the city's population. There are also a large number of unemployed residents; of these, 91% are Black. The working population is mainly made up of women. The largest percentage of economically active adults work in the retail and wholesale industry. Another quarter are in the financial and real estate sector. Lastly, 12% are in the manufacturing industry.