This visualization shows the hierarchical structure of world countries, organized by continent and subregion, as a horizontal tree diagram. It uses D3 v5’s `tree()` layout and `hierarchy()` to compute node positions, with `linkHorizontal()` drawing curved paths between parent and child nodes. Each country name is rendered as SVG text, with font size decreasing by depth. The view supports zooming and panning via D3’s `zoom()` behavior, applied to a containing `<g>` element. Data is loaded from a local `data.json` file, and styling uses the Playfair Display font.