This interactive tree visualization maps a hierarchical structure of world regions and countries, rendered as an SVG with D3 v5. The layout uses `d3.tree` and `d3.hierarchy` to position nodes, with `d3.linkHorizontal` drawing curved connections. Users can pan and zoom through the diagram via `d3.zoom`, applied to a group element. Node labels display region and country names with font sizes decreasing by depth, sourced from a local JSON file. The visualization is styled with Roboto font and semi-transparent text shadows for readability.