This visualization displays the hierarchical structure of world countries, organizing them by continent and subregion into a horizontal tree layout. The root node, "World," branches into continents like Asia, which further divide into subregions and individual countries. The SVG rendering uses D3.js v5’s `d3.tree`, `d3.hierarchy`, `d3.linkHorizontal`, and a zoom interaction via `d3.zoom` to navigate the large dataset. Node labels are positioned with dynamic font sizes based on depth, and the data loads asynchronously from a JSON file.