This example displays a geographic map using D3.js and TopoJSON. It shows country boundaries projected with the Natural Earth projection. The map is rendered as SVG paths generated from a GeoJSON dataset loaded from an external URL. The code uses `d3.geoPath()` to generate the path data and `d3.geoNaturalEarth1()` for the projection, with the TopoJSON library converting the input data into geographic features.