This example displays a world map rendered with an Eckert III projection using D3’s `geoNaturalEarth1` and `geoPath`. It visualizes land polygons, country borders via topojson mesh, graticules, and a sphere outline, all styled with CSS and dynamically loaded from the world-atlas TopoJSON dataset. The React component fetches data using `useData` with `json`, then passes the processed geoJSON features to SVG marks for rendering.