The map depicts a 3D view of population density across the Gauteng-City Region. The data was derived from StatsSA Census 2011 Small Area Layer, by proportionally assigning the population data to a randomly generated 1 km² grid. The highest density of 66 892 people per km² occurs in the Johannesburg CBD area, followed by Alexandra (41 305 people per km²). Areas within the Pretoria CBD, Diepsloot and Tembisa were the next densest places.