This visualization shows a hierarchical tree of world countries organized by continent and subregion, with text labels sized by depth. The tree layout uses D3’s `tree` layout with `linkHorizontal` paths, rendered as SVG. Zooming is enabled via `d3.zoom` on the root group, and the data is loaded from a local JSON file using `d3.json`. Country names are drawn with font size decreasing by depth, using the Playfair Display font.