This example displays a map of Austrian districts using SVG paths generated from TopoJSON data. The code projects geographic coordinates with the Mercator projection and renders boundaries via `d3.geoPath`. It fetches the TopoJSON file from a remote GitHub repository, converts it to GeoJSON features using the `feature` function from topojson, and appends the resulting paths to an SVG. The visualization uses D3 v5, including d3-array and d3-geo modules, with a fixed viewport of 960 by 500 pixels.