This interactive visualization presents a hierarchical tree of world countries organized by continent and subregion, rendered as a horizontal dendrogram using D3.js v5. The code loads hierarchical JSON data via `d3.json` and applies `d3.tree` layout with `d3.hierarchy` to position nodes, while `d3.linkHorizontal` generates curved paths for the connections. Text labels display country names with font sizes scaled by depth, and a `d3.zoom` behavior enables pan and zoom interactions. The SVG rendering uses a custom font and subtle text shadows to improve readability.