This visualization shows the hierarchical structure of countries organized by continent and subregion, with each country’s name displayed as a leaf node. The tree layout, generated using `d3.tree` and `d3.hierarchy`, positions nodes horizontally, and links are drawn with `d3.linkHorizontal` as SVG paths. Labels scale in font size based on tree depth, from large continent names to smaller country names, while the entire diagram supports pan and zoom via `d3.zoom`. Data is loaded from a JSON file using `d3.json`, and the SVG output is styled with a tan path color and a custom font.