This visualization displays the weekly incidence of flu cases across French regions throughout 2014, using a choropleth map where colors range from blue to yellow based on case counts. The map, rendered with D3 v4, employs the `d3.geoConicConformal` projection and `d3.geoPath` to draw regional boundaries from a GeoJSON file, while a linear color scale maps aggregated case data from a CSV dataset onto each region. The visualization merges tabular flu statistics with geographic shapes, providing a temporal overview of the seasonal epidemic's intensity and spread across the country.