This visualization shows a hierarchical tree of world countries organized by continent and subregion, using a left-to-right layout with curved links. It renders country and region names as text nodes, with font size decreasing by depth. Built with D3 v5, it uses `d3.tree`, `d3.hierarchy`, and `d3.linkHorizontal` to compute the layout and paths, while `d3.zoom` enables panning and zooming. The data comes from a JSON file, and the SVG output is styled with a custom serif font and teal link strokes.