This map of England uses a teal fill for regions and light pink strokes to highlight interior borders, with the geographic boundaries projected using D3’s `geoNaturalEarth1` and rendered as SVG paths via `geoPath`. Built with React, the visualization loads TopoJSON topology from a GitHub gist, converts it to geographic features and mesh lines using `topojson.feature` and `topojson.mesh`, and applies a projection scale of 5000 with a custom translation to center the country. The code leverages D3 v7 and React 18, with explicit CSS styling for the region and interior path elements.