This example displays a world choropleth base map using the Natural Earth projection, offering a visually balanced view of global landmasses and country borders. The visualization loads country boundary data from the world-atlas TopoJSON file via `d3.json`, then converts it to GeoJSON features using `topojson.feature` and mesh borders with `topojson.mesh`. The projection is applied through `d3.geoNaturalEarth1()` and paths are generated with `d3.geoPath`, while the SVG output renders land polygons with hover tooltips and boundary lines through D3's selection and joining API.