This example shows a world map with country boundaries, rendered in dark landmasses with teal interior borders and subtle graticules. The visualization uses React to manage the component structure, while d3’s `geoNaturalEarth1` projection and `geoPath` draw the geographic shapes. TopoJSON data from the World Atlas (countries-50m.json) is loaded asynchronously, with `feature` and `mesh` extracting land polygons and country borders. The styling is handled through SVG classes defined in CSS, and the map updates once the data is fetched.