A hierarchical tree layout of world regions and countries, arranged as a horizontal dendrogram with brown links branching from a root node labeled "World." The visualization uses D3 v5's `tree` and `hierarchy` functions to compute node positions, and a `linkHorizontal` path generator to draw the connecting curved edges. Data comes from a local `data.json` file containing nested geographic groupings, rendered as SVG paths that span the full browser viewport.