This map of Japan displays the country’s administrative boundaries as solid blue regions. Built with D3.js, it uses `d3.geoMercator` for projection and `d3.geoPath` to render geographic features from TopoJSON data. The map supports interactive zooming via D3’s `zoom()` component, which dynamically transforms the SVG group containing the paths. The visualization loads geographic data from a remote JSON source, applies a categorical color scale (`d3.scaleOrdinal`), and styles the regions with a blue fill and white stroke.