This visualization displays the counties of Sweden as filled geographic regions, with interior borders highlighted in a contrasting color. The map is rendered using React and D3 v5, employing `d3.geoMercator` projection and `d3.geoPath` to draw features from TopoJSON data in the world-atlas dataset. The code applies `projection.fitExtent` to fit the map within the SVG canvas. The dataset source is the Data Canvas Sense Your City project, with geographic boundaries from the world-atlas countries-10m.json file.