This visualization presents the hierarchical structure of world countries organized by continent and subregion, displayed as a horizontal tree layout. The hierarchical data is loaded from a JSON file and rendered as an SVG using D3 v5’s `tree` layout, `hierarchy`, and `linkHorizontal` path generator. Node labels are positioned according to their depth, with font size decreasing at deeper levels, and the entire graphic supports pan and zoom via D3’s `zoom` behavior.