This interactive visualization displays a hierarchical tree of world countries, organized first by continent and then by subregion. The layout flows horizontally, with larger text for parent nodes and smaller text for child nodes, connected by curved green links. Built with D3 v5, the visualization uses the `d3.tree` layout and `d3.linkHorizontal` path generators to structure the data, while `d3.zoom` enables panning and zooming of the SVG canvas. Text styling supports a serif font with a white shadow for readability.