This example demonstrates interactive map navigation with zoom and country selection using D3 v5. It renders a world map with a natural Earth projection, applying a blue sphere background and green country polygons with black borders. Viewers can click countries to trigger a selection state, though the visual feedback logic is commented out in the current code. The implementation uses d3.geoPath, d3.geoNaturalEarth1, and d3.zoom, with topojson for geographic data processing and d3.tsv for loading country name mappings from the World Atlas dataset.