This hierarchical tree chart displays a global geographic classification, starting with "World" and branching through continents and subregions down to individual countries. The visualization uses a horizontal link-and-node layout, with the root node on the left and child nodes extending rightward. Built with D3 v5, the implementation calls `d3.tree` and `d3.hierarchy` to structure the data, then uses `d3.linkHorizontal` to generate the curved SVG paths connecting nodes. The data is loaded from a JSON file, and the chart renders as an SVG element that fills the viewport.