This visualization displays global cities with populations exceeding 50,000 as semi-transparent circles sized proportionally to population using a square-root scale. The map uses a natural Earth projection, with country boundaries, interiors, and graticules rendered via d3.geoPath from TopoJSON world-atlas data. City coordinates are projected using d3.geoNaturalEarth1, with population data loaded from a Simplemaps CSV. The React component applies the size scale to each circle’s radius, creating an immediate visual comparison of urban population distribution across continents.