This visualization displays Swedish county boundaries as a choropleth-style map, using a Mercator projection fitted to the geographic data. Built with React and D3 v5, it loads TopoJSON from a remote URL and converts it to GeoJSON features using `topojson.feature` and `topojson.mesh`. The `d3.geoPath` generator renders the SVG paths, with counties filled in muted red and interior borders highlighted in cyan. The map uses a static color scheme without data-driven encoding, focusing on geometric clarity rather than quantitative variation.