A choropleth world map visualizes mock document counts by country, with countries colored on a scale from green to red based on their associated values. The map renders in SVG using the Mercator projection via `d3.geo.mercator` and `d3.geo.path`, with graticule lines drawn for reference. TopoJSON data from `world.json` is loaded and merged with aggregation data containing country codes and document counts, then filtered to exclude Antarctica. Country boundaries appear as white strokes, and users can hover to reveal labels, though labels remain hidden by default.