This visualization presents the hierarchical structure of world countries, organized by continents and subregions as a horizontal tree layout. It displays all country names as text labels linked by curved paths, with font sizes decreasing at deeper levels. The implementation uses D3 v5’s `tree` layout and `linkHorizontal` generator to position nodes and draw connections, with `d3.zoom` enabling pan and zoom. Data comes from a local JSON file, rendered as SVG with custom styling.