This example shows a world map of cities with populations above 50,000, plotted as small teal circles over light gray landmasses and graticules. The visualization uses React to render SVG elements, with D3 v5’s `geoNaturalEarth1`, `geoPath`, and `geoGraticule` for map projections and boundary lines. City coordinates come from a Simplemaps CSV, while country outlines derive from TopoJSON world atlas data, with interiors drawn as mesh strokes.