This example visualizes a world map using a Natural Earth projection, displaying landmasses filled with a teal color and graticule lines shown as subtle gray strokes. It marks the boundaries between countries with highlighted interior lines. The code uses the D3 library’s `geoNaturalEarth1` projection, `geoPath`, and `geoGraticule` functions within a React component, rendering the map as SVG. The geographic data is sourced from the `world-atlas` package via TopoJSON, which is processed using `feature` and `mesh` functions.