Your guests visiting Johannesburg, also known as the City of Gold, will see a completely different face of the African continent. The city has very modern and high standards of living compared to other African cities. Johannesburg is located on the southern slopes of hills that resemble highlands between the Vaal and Limpopo Rivers. Approximately 4.5 million people live in this city, which has a surface area of 508.69 km2. It is the most populous city in the Republic of South Africa, and ranked the third in African continent after Cairo and Lagos. Johannesburg is also one of the world's 50 largest metropolitan areas.