This visualization presents the hierarchical structure of world countries as an interactive tree diagram, organized by continent and subregion before listing individual nations. Using D3 v5’s `tree` layout and `linkHorizontal` path generator, the SVG renders curved links and text labels, with font size scaling by node depth. Pan and zoom functionality is enabled via the `zoom` behavior, allowing users to explore the full dataset loaded from `data.json`. The data is drawn from a static JSON file, and the styling employs the Playfair Display font with teal link strokes.