This choropleth map visualizes global population estimates for 2018, using circle size to represent population magnitude overlaid on country boundaries. The visualization employs d3.geoNaturalEarth1 projection with d3.geoPath for rendering geographic features, while circles are positioned via d3.geoCentroid. Data from the UN population estimates is merged with TopoJSON world atlas geometry. Interactive zooming is implemented with d3.zoom, and a custom size legend communicates the population scale using d3.scaleSqrt.