This example visualizes a world map using a Natural Earth projection, displaying country boundaries, graticule lines, and a blue sphere outline. It uses React with hooks to fetch TopoJSON data from the world-atlas package, then leverages `d3.geoNaturalEarth1` and `d3.geoPath` to project and render geographic features as SVG paths. The code separates land shapes, interior country borders, and graticules into distinct visual layers, with countries filled in teal and boundaries drawn in dark green.