This map visualizes global GDP data by shading each country on a natural Earth projection, with a viridis color scale representing economic output in billion USD. It uses d3.geoPath with topojson to render country boundaries from the world-atlas dataset, and d3.scaleSequential with d3.interpolateViridis for color encoding. Hovering over a country reveals a tooltip displaying the country name and GDP value, while a gradient legend annotates the color-to-value mapping.