This example displays a natural Earth projection world map with cities rendered as semi-transparent points, where point size encodes population using a square root scale. The visualization layers graticules, land masses, and country borders using `geoPath` and `geoGraticule` from D3 v5, while React manages the component state and SVG rendering. City data is loaded from a CSV file with population values, and the map uses geographic coordinates projected through `geoNaturalEarth1`. The visualization demonstrates how to combine D3’s geographic and scaling utilities within a React-based SVG scene.