This interactive world map visualizes country boundaries on a natural Earth projection, with a blue sphere background distinguishing ocean water. It uses D3.js version 5 with topojson to load and render GeoJSON features from the World Atlas 110m dataset. Countries appear as light green SVG paths with subtle black strokes, generated via `d3.geoPath()` and `geoNaturalEarth1()`. The sphere outline is drawn by passing a sphere GeoJSON object to the path generator.