This map visualizes cumulative COVID-19 cases per country as of June 6, 2021, using circle size to encode case counts over a natural Earth projection. Missing data appears in red, while countries with data are gray. The visualization loads spatial boundaries from TopoJSON and joins them with case counts from a CSV using `d3.csv` and `d3.json`. It employs `d3.geoPath` for map rendering, `d3.geoNaturalEarth1` for projection, and `d3.scaleSqrt` for proportional symbol sizing, with zoom via `d3.zoom` and interactive tooltips.