This visualization shows the hierarchical structure of world countries, organized by continent and subregion, with each country name displayed as a leaf node. The tree layout, generated with d3.tree and d3.hierarchy, positions nodes horizontally, and links are drawn using d3.linkHorizontal. The SVG rendering supports zooming and panning through d3.zoom, while font size decreases with depth to emphasize hierarchy. Data comes from a JSON file with nested continent and regional groupings.