This example visualizes the counties of Sweden as a choropleth-style map, rendered in black with white interior boundaries. The map is projected using D3’s `geoMercator` and drawn with `geoPath`, fitted to a 960×500 SVG canvas within a React framework. Data comes from a TopoJSON file of Swedish county borders, loaded via `d3.json` and processed with `topojson.feature` and `topojson.mesh`. The visualization highlights administrative divisions without additional quantitative encoding, focusing on geographic shape and boundary contrast.