This example displays a map of Ireland with a borehole cross-section in a modal window. Clicking a county opens an info box showing layered soil types, from topsoil to bedrock, with hover tooltips revealing depth details. The visualization uses d3.geoMercator projections and d3.geoPath to render the map, while topojson.feature processes the geographic data. The borehole diagram is built with SVG rectangles and lines, and d3.zoom enables interactive panning and scaling of the map.