A choropleth-style map of Swedish counties displays land divisions with teal region fills and lighter stroke boundaries, while shared interior borders are highlighted in a contrasting mint color. The visualization uses a React component with D3 v5, specifically `d3.geoMercator` for projection and `d3.geoPath` to render geographic features from TopoJSON data. The map is fitted to a 960×500 SVG viewport using `projection.fitExtent`, and the data source is a remote JSON file containing Swedish administrative geographies.