This visualization displays the hierarchical structure of world countries, organized by continent and subregion. It uses a tidy tree layout where each node represents a geopolitical entity, with edges drawn as curved paths. Built with D3 v5, the code loads hierarchical JSON data and applies a `tree` layout to position nodes. It renders the visualization as an SVG using `linkHorizontal` for connecting paths and includes zoom functionality via the `zoom` event handler. Text labels are styled with the Playfair Display font.