This interactive visualization displays a hierarchical tree of world countries, organized by continent and then by subregion. The data is structured in a JSON file, with each node representing a geographic entity, from continents down to individual nations. The tree uses D3.js v5 to render the data as an SVG with horizontal connecting lines, and node labels set in the Playfair Display serif font. The visualization relies on D3’s `hierarchy` and `tree` layout functions to position the nodes and generate the link paths.