This visualization shows the hierarchical structure of world countries organized by continent and subregion, displayed as a horizontal tree diagram. The layout derives from a JSON dataset containing the United Nations’ geographical groupings, with text labels at each hierarchy level sized by depth. The implementation uses D3 v5’s `tree` and `hierarchy` layouts to compute positions, `linkHorizontal` for the connecting paths, and `zoom` to enable panning and scaling. All rendering is done as SVG elements within a `g` container, styled with Playfair Display fonts and teal-colored links.