This example displays a world map with country boundaries and graticules, rendered as an SVG using React and D3 v5. It uses the `geoNaturalEarth1` projection and `geoPath` to draw landmasses, interior borders, and a graticule grid, with the sphere outline shown in light gray. The data comes from the World Atlas TopoJSON file, processed via the `topojson` feature and mesh utilities, and styled with CSS classes for land, interiors, and graticules.