This example uses D3.js v5 to render an interactive-free SVG map of Guangzhou. It draws a blue sphere as a base layer, then projects and displays light green country polygons on top using the Natural Earth projection. The geographic data is loaded from a JSON file provided by geo.datav.aliyun.com, and the topojson library converts it into GeoJSON features. The code leverages `d3.geoNaturalEarth1` for projection and `d3.geoPath` to generate the SVG paths, with styling applied through CSS classes.