This example visualizes the geographic distribution of cities as small, semi-transparent points overlaid on a world map. The map is rendered using React and D3, with landmasses and graticules drawn via `d3.geoPath` and `d3.geoGraticule` from a Natural Earth TopoJSON source. City coordinates are loaded from a CSV file and projected using `d3.geoNaturalEarth1`, with each point plotted as an SVG circle. The styling uses a light gray for land and graticules, contrasting with the teal city points.