This example displays a polished world map with country boundaries, rendered as an SVG using the natural Earth projection. The visualization shows landmasses in teal, graticules, and country interior borders, all styled with custom CSS. It uses React to manage the component hierarchy, with `d3.geoNaturalEarth1` and `d3.geoPath` for projection and path generation, and `d3.geoGraticule` for the grid overlay. Data is loaded from the World Atlas TopoJSON using `d3.json` and processed with `topojson.feature` and `topojson.mesh` to extract land and interior boundaries.