This interactive world map shows BMW sales volumes across six continental regions, using proportionally sized circles whose areas scale with total sales. Hovering over a circle reveals the exact regional sales total in units, while each marker displays its volume in thousands. The visualization leverages D3.js, including `geoNaturalEarth1` projection and `geoPath`, to render the map from TopoJSON data, while the sales data is processed from a CSV file and aggregated by region using `d3.rollup` and `d3.sum`. Circle radii are determined by a square-root scale to accurately represent differences in volume.