A horizontal stacked bar chart ranks the top 10 most populous countries by total population, with each bar segmented by land area categories. A linked categorical color legend allows hovering to highlight and fade corresponding segments. The visualization uses D3.js APIs including `flatRollup`, `stack`, `scaleLinear`, and `scaleBand` for data aggregation and layout. The responsive design uses `observeResize`, while `colorLegend` functions handle interactive highlighting. Data comes from the `religionByCountryTop20.csv` file.