This world map visualization shows BMW sales volume by region, using color intensity on individual countries to represent total sales figures across six global regions. The map renders geographic boundaries as SVG paths via `d3.geoPath` with a `d3.geoNaturalEarth1` projection. Sales data from data.csv is aggregated per region with `d3.rollup`, then each country is colored according to its region’s total. Hovering highlights countries and a tooltip displays details, while a legend and subtitle clarify the regional color coding. The code relies on d3.v7 and topojson to load and project the world geometry.