This visualization displays world cities as points on a natural Earth projection, with point size mapped to population via a square-root scale. The map renders landmasses, graticules, and country interiors using `d3.geoPath` from the `d3` library. City data is loaded as a CSV, while world topology comes from the `world-atlas` package, with React managing the application state and SVG rendering. Hovering over a city reveals a tooltip with its name, country, and population.