This interactive visualization depicts the hierarchical structure of world countries, organized by continent and subregion, using a tree layout rendered as an SVG. The D3.js v5 library's `tree`, `hierarchy`, and `linkHorizontal` APIs generate the node-link diagram from a JSON data file. Text labels display each country's name, with font size varying by depth. A zooming capability, implemented via D3's `zoom` and `event` methods, allows users to pan and scale the view.