This visualization shows a hierarchical tree of world countries, organized by continent and subregion. The layout uses the D3 `tree()` function on hierarchical JSON data, positioning leaf nodes like Afghanistan and India under regional groupings such as Southern Asia. SVG paths connect parent-child relationships, rendered with a yellow-to-teal linear gradient. Text labels display each country’s name, with font size decreasing by depth. The view supports zooming and panning through the D3 `zoom()` behavior on the SVG container.