This visualization uses a hierarchical tree layout to organize world countries by continent and subregion, with each country name rendered as a text label. The code builds the tree with `d3.hierarchy` and `d3.tree`, draws curved link paths using `d3.linkHorizontal`, and applies zoom via `d3.zoom`. Labels scale in font size based on depth. Data comes from the local `data.json` file, and the SVG output uses a custom Playfair Display font.