This example visualizes cities with populations over 50,000 as semi-transparent circles on a natural Earth projection, using a graticule, land masses, and interiors to provide geographic context. The map is rendered in SVG via React, with D3’s `geoNaturalEarth1`, `geoPath`, and `geoGraticule` handling projections and paths. City coordinates are projected from latitudes and longitudes loaded from a CSV, while country boundaries come from the World Atlas TopoJSON source.