This example creates a world map by rendering GeoJSON country boundaries onto an SVG. It first draws a blue sphere background and then overlays light green country paths with subtle black strokes, using the Natural Earth projection. The code loads world topology data from the world-atlas package and converts it to GeoJSON using topojson’s `feature` method, then applies `d3.geoPath` with `geoNaturalEarth1` for projection. Both D3 and TopoJSON libraries are included via CDN.