This example displays city locations as semi-transparent teal dots on a natural Earth projection world map, highlighting urban centers with populations exceeding 50,000. The visualization uses React for component structure and D3 v5’s `geoNaturalEarth1` projection with `geoPath` to render land masses, country boundaries, graticules, and a sphere outline. City coordinates from the Simplemaps World Cities Database are projected using `projection([d.lng, d.lat])` into SVG circles. The map background and land fill are styled via CSS, with graticules providing geographic reference lines.