This map visualizes country borders using a natural Earth projection, with country names displayed as tooltips on hover. The visualization uses D3 v5’s `d3.geoPath` and `geoNaturalEarth1` for geographic projection, while TopoJSON’s `feature` method extracts country geometries from world-atlas data. Countries are rendered as SVG paths styled with CSS. The map supports zooming and panning through D3’s `zoom` behavior, which applies a transform to all country shapes. The data comes from the world-atlas TopoJSON and TSV files, which provide geometry and country names.