This visualization shows the hierarchical structure of world countries, organized by continent and subregion, as a horizontal tree layout with curved links. The interactive view supports zooming and panning through D3’s zoom behavior. Built with D3 v5, it uses `d3.json` to load hierarchical data, `d3.hierarchy` and `d3.tree` for layout, and `linkHorizontal` for edge paths. Text labels are styled with the Permanent Marker font, and SVG rendering displays the full country hierarchy from the provided `data.json` source.