This visualization shows the hierarchical organization of world countries, grouped by continent and subregion, as a horizontal tree layout. It uses D3 v5’s `tree` layout and `hierarchy` to compute node positions, with `linkHorizontal` drawing curved edges between levels. Country and region names are rendered as SVG text, with font size decreasing by depth. The view supports pan and zoom via D3’s `zoom` behavior, and data is loaded from a local `data.json` file.