This example shows a choropleth-style map of Bangladesh, displaying the country’s districts with green fills and teal borders for internal boundaries. The visualization renders as an SVG using React, with the `geoMercator` projection and `geoPath` from D3 v5. TopoJSON data is loaded from a GitHub repository and converted to GeoJSON using the `feature` and `mesh` functions. The projection is fitted to the map extent, and district paths are drawn individually, with interior mesh lines separating administrative regions.