This example displays a world map with country boundaries, rendered as an SVG using React and D3 v5. It uses the `d3.geoEqualEarth` projection and `d3.geoPath` to draw the sphere, graticules, landmasses, and country interiors, with geospatial data sourced from a GeoJSON file. The visualization is styled with distinct fill and stroke colors, applying a clean, polished aesthetic while the map loads asynchronously via the `json` function from D3.