This map visualization displays world countries on a natural Earth projection, allowing users to click individual countries to toggle their fill between light green and red. Built with D3.js v5 and TopoJSON, it loads geographic data from the world-atlas package and country names from a TSV file. The visualization uses d3.geoPath and d3.geoNaturalEarth1 for rendering, with d3.zoom enabling pan and zoom interactions on the SVG canvas.