A choropleth map of Palghar district, India, uses SVG paths from `d3.geoPath` to show the percentage of stunted children per block. Each polygon’s fill is a texture pattern from the `textures` library, with stroke width varying by value. A range slider (from `d3-simple-slider`) filters the choropleth by adjusting low/high thresholds, triggering an animated `transition` on the fills. Tooltips display block names and exact percentages on hover.