This visualization displays the hierarchical structure of world countries, organized by continent and subregion, as an interactive tree diagram. It shows the data from a JSON file that groups countries geographically. The visualization is rendered as an SVG using D3.js version 5, employing the `d3.tree` layout and `d3.hierarchy` functions to compute the tree structure, with horizontal link paths. The implementation uses D3's zoom functionality for pan and scale interactions, while text labels are displayed with the Playfair Display font.