A choropleth map of China renders each province as an SVG path using a Mercator projection centered on the country. The D3.js code loads GeoJSON map data and applies a categorical color scale, with provinces highlighted yellow on mouseover. Province names are positioned using projected centroid coordinates, with a vertical offset applied to prevent overlap between Macau and Hong Kong labels. The visualization demonstrates D3’s geographic path generator (`d3.geoPath`) and projection utilities.