A choropleth map displays countries with a uniform green fill, turning red on hover while the ocean remains light blue. The visualization uses an orthographic projection, rendering country boundaries as SVG paths via the `geoPath` and `geoOrthographic` functions. It loads world map data from the `world-atlas` package (50m JSON and TSV files) and processes TopoJSON features with the `topojson` library. The `zoom` interaction allows panning and scaling the map through SVG transforms, with country names shown in tooltips.