This visualization shows a hierarchical tree of world countries, organized by continent and subregion, with each country name displayed as a text label. The tree layout positions nodes horizontally, with links drawn as curved paths in green. The visualization uses D3 v5's `tree` and `hierarchy` functions to compute the layout, `linkHorizontal` for path generation, and `zoom` for pan and zoom interactions. Data is loaded from a JSON file, rendered as SVG, and styled with the Playfair Display font.