This interactive map displays England’s geographical regions, filled in teal with grey boundaries between adjacent areas. The visualization uses a natural Earth projection via `d3.geoNaturalEarth1` to render the regions as SVG paths. Data is loaded from a TopoJSON file using `d3.json` and converted to GeoJSON features and mesh lines via `topojson.feature` and `topojson.mesh`. The React app manages state with a custom `useData` hook, and `d3.geoPath` computes the path geometries for rendering.