This example visualizes a world map with points representing cities whose populations exceed 50,000. Using a natural Earth projection, it renders landmasses, graticules, and the sphere outline via `d3.geoPath`, while `d3.geoNaturalEarth1` handles the projection. City locations are plotted as SVG circles, with coordinates transformed through the projection function. The map uses a light gray land fill and teal points, with data sourced from the World Cities Database and country boundaries from World Atlas TopoJSON. The visualization is built with React, D3 v5, and TopoJSON.