This interactive visualization displays the hierarchical structure of world countries, organized by continent and subregion using a horizontal tree layout. Users can pan and zoom through the SVG-based diagram, which renders country names as text nodes connected by white paths. Built with D3 v5, the example uses the `tree`, `hierarchy`, `linkHorizontal`, and `zoom` APIs to compute the layout and handle navigation. Data is loaded from a JSON file containing a nested structure of geographic regions and countries, with styling applied via custom CSS.