This example shows a world map rendered with a Natural Earth projection, where each country is filled in light green and the surrounding sphere is blue. The visualization displays geographic boundaries as SVG paths, with countries loaded from external TopoJSON data and converted into GeoJSON features. The code uses d3.geoNaturalEarth1 for projection, d3.geoPath to generate path data, and the topojson.feature method to parse the geographic data.