This visualization presents the hierarchical structure of world countries, organized by continent and subregion, as a horizontal tree diagram. The layout uses a `d3.tree` layout with `d3.hierarchy` and renders nodes as labels and edges as horizontal links via `d3.linkHorizontal`. Node text size decreases with depth, and the view supports zooming through a `d3.zoom` event handler. Data is loaded from a JSON file, styled with the Playfair Display font, and rendered as an SVG with a green stroke for connections.