This map shows the nine official regions of England, with each region filled in teal and internal boundaries highlighted in light gray. It uses a Natural Earth projection via `d3.geoNaturalEarth1` and renders paths with `d3.geoPath`. The GeoJSON is derived from a TopoJSON file using `topojson.feature` and `topojson.mesh` for region outlines and shared borders, with React managing the SVG output.