This visualization maps the global spread of COVID-19 by showing arcs from origin to destination countries, with circles marking each origin point and labels identifying the source country. The arcs are colored by origin country using a categorical scale, while a text list on the side ranks countries by the number of outgoing transmissions. The code uses `d3.geoNaturalEarth1` for the projection, `d3.geoPath` to draw country boundaries and arcs, and loads geographic data from a TopoJSON world atlas alongside two CSV files containing transmission records.