A world map scatter plot displays the population of cities as semi-transparent circular points, sized by a square-root scale so larger cities appear with proportionally larger radii. The visualization uses an equal-earth projection with graticules and country boundaries, rendered via D3’s `geoPath` and `geoGraticule` in SVG. City data comes from a CSV of world cities, with sphere and country shapes drawn from a TopoJSON world atlas. React manages the interface, while D3’s `scaleSqrt` maps population values to visual radius.