This visualization shows the hierarchical structure of world countries, organized by continent and subregion, as a horizontal tree layout. Each country appears as a text label positioned according to its depth in the hierarchy, with curved link paths connecting parent and child nodes. The implementation uses d3.hierarchy, d3.tree, and d3.linkHorizontal to compute the layout, while d3.zoom enables panning and scaling of the SVG graphic. The data comes from a JSON file grouping countries under regions like Asia and subregions such as Southern Asia.