This map of China visualizes provincial data on affection types, specifically highlighting the "Unknown" category through red circles positioned at each province’s centroid. The map uses an SVG rendering with a Mercator projection and loads geographic boundaries from a TopoJSON file while joining CSV data by province ID. Circle radii are scaled using `d3.scaleSqrt` based on unknown values, with a custom size legend showing tick values. Provinces are colored using `d3.scaleOrdinal` with `schemeCategory10`, and hover effects change fill to red. The visualization relies on `d3.geoPath`, `d3.geoCentroid`, and `d3.zoom` for interaction.