This example combines a choropleth map and a bubble chart to compare top wine-producing countries. The map colors each country by production volume using a white-to-blue scale, while the scatter plot positions countries by fertility rate and life expectancy, with bubble size reflecting wine quantity. Hovering over a country on either view highlights its data in both. The visualization uses d3.geoPath with a geoEqualEarth projection for the map, d3.scaleLinear for color and size encodings, and d3.csv to load the production data.