This hierarchical tree visualization displays the structure of world countries, grouped by continent and subregion. Country names are rendered as text nodes, connected by horizontal link paths to reveal the geographic taxonomy. The visualization uses D3 v5’s `tree` layout, `hierarchy`, and `linkHorizontal` functions to position nodes and draw edges, with interactive zooming enabled via `d3.zoom`. Data comes from a JSON file containing the nested world regions, with text styling applied for readability.