This visualization presents a hierarchical tree of world countries, organized by continent and subregion. It uses a left-to-right tree layout with curved links and sized text labels, where font size decreases with depth. The rendering is built with D3 v5, using `d3.tree`, `d3.hierarchy`, `d3.linkHorizontal`, and `d3.zoom` for pan and zoom interactions. Data comes from a nested JSON file containing country groupings.