This example shows bubbles with area proportional to each country’s population (2016) superimposed on a world map. Bubbles are also colored according to the continent.
Showing population and geography together, this map could probably be better redesigned as a choropleth of population density. This example is an exercise to prepare for different kinds of data, for which a geographical density would not make sense.
Population data is obtained from data.worldbank.org. The name of the source is “World Development Indicators” and was last updated on 2017, August 2nd.