A choropleth map of Swedish counties rendered as SVG paths, colored in a dark red with light gray borders. The map uses a Mercator projection fitted to the county boundaries, with internal borders highlighted in purple. The visualization is built with React using d3.geoPath for projection and path generation, and topojson’s feature and mesh functions to extract county polygons and interior boundaries from a TopoJSON dataset. The code includes commented-out options for an equal-earth projection and for scaling/centering the map, but the active projection uses d3.geoMercator.