This example displays a map of Europe using a Mercator projection, where individual countries are filled with a muted red-brown color and their internal administrative boundaries are highlighted in cyan. The map is drawn with SVG paths generated from TopoJSON data using D3’s `geoPath` and `geoMercator` functions within a React component. The geographic data for the countries comes from an ArcGIS-hosted source via a gist URL, processed with the `topojson` library to extract features and interior mesh lines. The visualization is rendered at 960 by 500 pixels, with the projection fitted to the canvas extent.