This example visualizes world country boundaries and landmasses on a natural Earth projection, using a teal color scheme for land and gray for the sphere. It loads GeoJSON from the World Atlas TopoJSON dataset via `d3.json` and `topojson.feature`, with `topojson.mesh` drawing interior borders. The React component renders SVG paths generated by `d3.geoPath` and `d3.geoNaturalEarth1`, including graticules and a sphere outline. The map updates asynchronously after data fetching, displaying a loading message until the data arrives.