This example displays a choropleth map of India with district-level boundaries colored by state and state outlines highlighted in green. Built with React and D3, it uses `d3.geoMercator` for projection, `d3.geoPath` for rendering, and `d3.zoom` for pan and zoom interactions. The visualization renders as SVG, combining TopoJSON data from two sources—one for state borders and another for district polygons. Hovering over districts turns them black, with tooltips revealing district and state names.