A world map displays country boundaries alongside graticules using World Atlas TopoJSON data. The visualization employs d3.geoNaturalEarth1 and d3.geoPath for projection and rendering, with d3.geoGraticule generating the grid. React manages the component structure, while CSS styles landmasses, oceans, and boundary strokes. The code processes topology through topojson.feature and topojson.mesh to extract land polygons and interior borders.