This example builds a world map using D3 version 5 and React. It renders country boundaries as SVG paths with a light green fill and dark green strokes, over a blue ocean sphere. The map uses the `geoNaturalEarth1` projection and `geoPath` for geographic shape generation, with data loaded from a TopoJSON file via `json` and processed with `feature`. A static SVG element supplies the container for all drawn paths.